US20180076982A1 - Apparatus and methods for inducing electromagnetic waves on an uninsulated conductor - Google Patents

Abstract

Aspects of the subject disclosure may include, receiving a plurality of communication signals, and generating, by a transmitting device according to the plurality of communication signals, a plurality of wireless signals that induces a plurality of electromagnetic waves that propagates along a pseudo dielectric layer of an uninsulated conductor. The plurality of electromagnetic waves can propagate along the pseudo dielectric layer of the uninsulated conductor without an electrical return path, each electromagnetic wave of the plurality of electromagnetic waves conveying at least a portion of the plurality of communication signals. Other embodiments are disclosed.

Description

CROSS-REFERENCE TO RELATED APPLICATION(S)
• This application is a continuation-in-part of U.S. application Ser. No. 15/293,819 filed Oct. 14, 2016, which is a continuation-in-part of U.S. application Ser. No. 15/293,608 filed Oct. 14, 2016, which is a continuation-in-part of U.S. application Ser. No. 15/274,987 filed Sep. 23, 2016, which is a continuation-in-part of U.S. application Ser. No. 14/965,523 filed Dec. 10, 2015, which is a continuation-in-part of U.S. application Ser. No. 14/885,463 (now U.S. Pat. No. 9,722,318) filed Oct. 16, 2015, which is a continuation-in-part of an U.S. application Ser. No. 14/799,272 (now U.S. Pat. No. 9,628,116) filed Jul. 14, 2015. All sections of the aforementioned applications and patents are incorporated herein by reference in its entirety.
FIELD OF THE DISCLOSURE
• The subject disclosure relates to apparatus and methods for inducing electromagnetic waves on an uninsulated conductor.
BACKGROUND
• As smart phones and other portable devices increasingly become ubiquitous, and data usage increases, macrocell base station devices and existing wireless infrastructure in turn require higher bandwidth capability in order to address the increased demand. To provide additional mobile bandwidth, small cell deployment is being pursued, with microcells and picocells providing coverage for much smaller areas than traditional macrocells.
• In addition, most homes and businesses have grown to rely on broadband data access for services such as voice, video and Internet browsing, etc. Broadband access networks include satellite, 4G or 5G wireless, power line communication, fiber, cable, and telephone networks.
BRIEF DESCRIPTION OF THE DRAWINGS
• Reference will now be made to the accompanying drawings, which are not necessarily drawn to scale, and wherein:
• FIG. 1 is a block diagram illustrating an example, non-limiting embodiment of a guided-wave communications system in accordance with various aspects described herein.
• FIG. 2 is a block diagram illustrating an example, non-limiting embodiment of a transmission device in accordance with various aspects described herein.
• FIG. 3 is a graphical diagram illustrating an example, non-limiting embodiment of an electromagnetic field distribution in accordance with various aspects described herein.
• FIG. 4 is a graphical diagram illustrating an example, non-limiting embodiment of an electromagnetic field distribution in accordance with various aspects described herein.
• FIG. 5A is a graphical diagram illustrating an example, non-limiting embodiment of a frequency response in accordance with various aspects described herein.
• FIG. 5B is a graphical diagram illustrating example, non-limiting embodiments of a longitudinal cross-section of an insulated wire depicting fields of guided electromagnetic waves at various operating frequencies in accordance with various aspects described herein.
• FIG. 6 is a graphical diagram illustrating an example, non-limiting embodiment of an electromagnetic field distribution in accordance with various aspects described herein.
• FIG. 7 is a block diagram illustrating an example, non-limiting embodiment of an arc coupler in accordance with various aspects described herein.
• FIG. 8 is a block diagram illustrating an example, non-limiting embodiment of an arc coupler in accordance with various aspects described herein.
• FIG. 9A is a block diagram illustrating an example, non-limiting embodiment of a stub coupler in accordance with various aspects described herein.
• FIG. 9B is a diagram illustrating an example, non-limiting embodiment of an electromagnetic distribution in accordance with various aspects described herein.
• FIGS. 10A and 10B are block diagrams illustrating example, non-limiting embodiments of couplers and transceivers in accordance with various aspects described herein.
• FIG. 11 is a block diagram illustrating an example, non-limiting embodiment of a dual stub coupler in accordance with various aspects described herein.
• FIG. 12 is a block diagram illustrating an example, non-limiting embodiment of a repeater system in accordance with various aspects described herein.
• FIG. 13 illustrates a block diagram illustrating an example, non-limiting embodiment of a bidirectional repeater in accordance with various aspects described herein.
• FIG. 14 is a block diagram illustrating an example, non-limiting embodiment of a waveguide system in accordance with various aspects described herein.
• FIG. 15 is a block diagram illustrating an example, non-limiting embodiment of a guided-wave communications system in accordance with various aspects described herein.
• FIGS. 16A & 16B are block diagrams illustrating an example, non-limiting embodiment of a system for managing a power grid communication system in accordance with various aspects described herein.
• FIG. 17A illustrates a flow diagram of an example, non-limiting embodiment of a method for detecting and mitigating disturbances occurring in a communication network of the system ofFIGS. 16A and 16B.
• FIG. 17B illustrates a flow diagram of an example, non-limiting embodiment of a method for detecting and mitigating disturbances occurring in a communication network of the system ofFIGS. 16A and 16B.
• FIGS. 18A, 18B, and 18C are block diagrams illustrating example, non-limiting embodiment of a transmission medium for propagating guided electromagnetic waves.
• FIG. 18D is a block diagram illustrating an example, non-limiting embodiment of bundled transmission media in accordance with various aspects described herein.
• FIG. 18E is a block diagram illustrating an example, non-limiting embodiment of a plot depicting cross-talk between first and second transmission mediums of the bundled transmission media ofFIG. 18D in accordance with various aspects described herein.
• FIG. 18F is a block diagram illustrating an example, non-limiting embodiment of bundled transmission media to mitigate cross-talk in accordance with various aspects described herein.
• FIGS. 18G and 18H are block diagrams illustrating example, non-limiting embodiments of a transmission medium with an inner waveguide in accordance with various aspects described herein.
• FIGS. 18I and 18J are block diagrams illustrating example, non-limiting embodiments of connector configurations that can be used with the transmission medium ofFIG. 18A, 18B, or18C.
• FIG. 18K is a block diagram illustrating example, non-limiting embodiments of transmission mediums for propagating guided electromagnetic waves.
• FIG. 18L is a block diagram illustrating example, non-limiting embodiments of bundled transmission media to mitigate cross-talk in accordance with various aspects described herein.
• FIG. 18M is a block diagram illustrating an example, non-limiting embodiment of exposed stubs from the bundled transmission media for use as antennas in accordance with various aspects described herein.
• FIGS. 18N, 18O, 18P, 18Q, 18R, 18S, 18T, 18U, 18V and 18W are block diagrams illustrating example, non-limiting embodiments of a waveguide device for transmitting or receiving electromagnetic waves in accordance with various aspects described herein.
• FIGS. 19A and 19B are block diagrams illustrating example, non-limiting embodiments of a dielectric antenna and corresponding gain and field intensity plots in accordance with various aspects described herein.
• FIGS. 19C and 19D are block diagrams illustrating example, non-limiting embodiments of a dielectric antenna coupled to a lens and corresponding gain and field intensity plots in accordance with various aspects described herein.
• FIGS. 19E and 19F are block diagrams illustrating example, non-limiting embodiments of a dielectric antenna coupled to a lens with ridges and corresponding gain and field intensity plots in accordance with various aspects described herein.
• FIG. 19G is a block diagram illustrating an example, non-limiting embodiment of a dielectric antenna having an elliptical structure in accordance with various aspects described herein.
• FIG. 19H is a block diagram illustrating an example, non-limiting embodiment of near-field and far-field signals emitted by the dielectric antenna ofFIG. 19G in accordance with various aspects described herein.
• FIG. 19I is a block diagrams of example, non-limiting embodiments of a dielectric antenna for adjusting far-field wireless signals in accordance with various aspects described herein.
• FIGS. 19J and 19K are block diagrams of example, non-limiting embodiments of a flange that can be coupled to a dielectric antenna in accordance with various aspects described herein.
• FIG. 19L is a block diagram of example, non-limiting embodiments of the flange, waveguide and dielectric antenna assembly in accordance with various aspects described herein.
• FIG. 19M is a block diagram of an example, non-limiting embodiment of a dielectric antenna coupled to a gimbal for directing wireless signals generated by the dielectric antenna in accordance with various aspects described herein.
• FIG. 19N is a block diagram of an example, non-limiting embodiment of a dielectric antenna in accordance with various aspects described herein.
• FIG. 19O is a block diagram of an example, non-limiting embodiment of an array of dielectric antennas configurable for steering wireless signals in accordance with various aspects described herein.
• FIGS.19P1,19P2,19P3,19P4,19P5,19P6,19P7 and19P8 are side-view block diagrams of example, non-limiting embodiments of a cable, a flange, and dielectric antenna assembly in accordance with various aspects described herein.
• FIGS.19Q1,19Q2 and19Q3 are front-view block diagrams of example, non-limiting embodiments of dielectric antennas in accordance with various aspects described herein.
• FIGS. 20A and 20B are block diagrams illustrating example, non-limiting embodiments of the transmission medium ofFIG. 18A used for inducing guided electromagnetic waves on power lines supported by utility poles.
• FIG. 20C is a block diagram of an example, non-limiting embodiment of a communication network in accordance with various aspects described herein.
• FIG. 20D is a block diagram of an example, non-limiting embodiment of an antenna mount for use in a communication network in accordance with various aspects described herein.
• FIG. 20E is a block diagram of an example, non-limiting embodiment of an antenna mount for use in a communication network in accordance with various aspects described herein.
• FIG. 20F is a block diagram of an example, non-limiting embodiment of an antenna mount for use in a communication network in accordance with various aspects described herein.
• FIG. 21A illustrates a flow diagram of an example, non-limiting embodiment of a method for transmitting downlink signals.
• FIG. 21B illustrates a flow diagram of an example, non-limiting embodiment of a method for transmitting uplink signals.
• FIG. 21C illustrates a flow diagram of an example, non-limiting embodiment of a method for inducing and receiving electromagnetic waves on a transmission medium.
• FIG. 21D illustrates a flow diagram of an example, non-limiting embodiment of a method for inducing and receiving electromagnetic waves on a transmission medium.
• FIG. 21E illustrates a flow diagram of an example, non-limiting embodiment of a method for transmitting wireless signals from a dielectric antenna.
• FIG. 21F illustrates a flow diagram of an example, non-limiting embodiment of a method for receiving wireless signals at a dielectric antenna.
• FIG. 21G illustrates a flow diagram of an example, non-limiting embodiment of a method for detecting and mitigating disturbances occurring in a communication network.
• FIG. 21H is a block diagram illustrating an example, non-limiting embodiment of an alignment of fields of an electromagnetic wave to mitigate propagation losses due to water accumulation on a transmission medium in accordance with various aspects described herein.
• FIGS. 21I and 21J are block diagrams illustrating example, non-limiting embodiments of electric field intensities of different electromagnetic waves propagating in the cable illustrated inFIG. 20H in accordance with various aspects described herein.
• FIG. 21K is a block diagram illustrating an example, non-limiting embodiment of electric fields of a Goubau wave in accordance with various aspects described herein.
• FIG. 21L is a block diagram illustrating an example, non-limiting embodiment of electric fields of a hybrid wave in accordance with various aspects described herein.
• FIG. 21M is a block diagram illustrating an example, non-limiting embodiment of electric field characteristics of a hybrid wave versus a Goubau wave in accordance with various aspects described herein.
• FIG. 21N is a block diagram illustrating an example, non-limiting embodiment of mode sizes of hybrid waves at various operating frequencies in accordance with various aspects described herein.
• FIGS. 22A and 22B are block diagrams illustrating example, non-limiting embodiments of a waveguide device for launching hybrid waves in accordance with various aspects described herein.
• FIG. 23 is a block diagram illustrating an example, non-limiting embodiment of a hybrid wave launched by the waveguide device ofFIGS. 21A and 21B in accordance with various aspects described herein.
• FIG. 24 illustrates a flow diagram of an example, non-limiting embodiment of a method for managing electromagnetic waves.
• FIGS. 25A, 25B, 25C, and 25D are block diagrams illustrating example, non-limiting embodiments of a waveguide device in accordance with various aspects described herein.
• FIGS. 25E, 25F, 25G, 25H, 25I, 25J, 25K, 25L, 25M, 25N, 25O, 25P, 25Q, 25R, 25S, and 25T are block diagrams illustrating example, non-limiting embodiments of wave modes and electric field plots in accordance with various aspects described herein.
• FIG. 25U is a block diagram illustrating an example, non-limiting embodiment of a waveguide device in accordance with various aspects described herein.
• FIGS. 25V, 25W, 25X are block diagrams illustrating example, non-limiting embodiments of wave modes and electric field plots in accordance with various aspects described herein.
• FIG. 25Y illustrates a flow diagrams of an example, non-limiting embodiment of a method for managing electromagnetic waves.
• FIG. 25Z is a block diagram illustrating an example, non-limiting embodiment of substantially orthogonal wave modes in accordance with various aspects described herein.
• FIG. 25AA is a block diagram illustrating an example, non-limiting embodiment of an insulated conductor in accordance with various aspects described herein.
• FIG. 25AB is a block diagram illustrating an example, non-limiting embodiment of an uninsulated conductor in accordance with various aspects described herein.
• FIG. 25AC is a block diagram illustrating an example, non-limiting embodiment of an oxide layer formed on the uninsulated conductor ofFIG. 25AB in accordance with various aspects described herein.
• FIG. 25AD is a block diagram illustrating example, non-limiting embodiments of spectral plots in accordance with various aspects described herein.
• FIG. 25AE is a block diagram illustrating example, non-limiting embodiments of spectral plots in accordance with various aspects described herein.
• FIG. 25AF is a block diagram illustrating example, non-limiting embodiments of a wave mode and electric field plot in accordance with various aspects described herein.
• FIG. 25AG is a block diagram illustrating example, non-limiting embodiments for transmitting orthogonal wave modes according to the method ofFIG. 25Y in accordance with various aspects described herein.
• FIG. 25AH is a block diagram illustrating example, non-limiting embodiments for transmitting orthogonal wave modes according to the method ofFIG. 25Y in accordance with various aspects described herein.
• FIG. 25AI is a block diagram illustrating example, non-limiting embodiments for selectively receiving a wave mode according to the method ofFIG. 25Y in accordance with various aspects described herein.
• FIG. 25AJ is a block diagram illustrating example, non-limiting embodiments for selectively receiving a wave mode according to the method ofFIG. 25Y in accordance with various aspects described herein.
• FIG. 25AK is a block diagram illustrating example, non-limiting embodiments for selectively receiving a wave mode according to the method ofFIG. 25Y in accordance with various aspects described herein.
• FIG. 25AL is a block diagram illustrating example, non-limiting embodiments for selectively receiving a wave mode according to the method ofFIG. 25Y in accordance with various aspects described herein.
• FIGS. 25AM and 25AN are block diagrams illustrating example, non-limiting embodiments of transmission media for propagating electromagnetic waves in accordance with various aspects described herein.
• FIG. 25AO illustrates a flow diagram of an example, non-limiting embodiment of a method for transmitting electromagnetic waves in accordance with various aspects described herein.
• FIG. 25AP illustrates a flow diagram of an example, non-limiting embodiment of a method for receiving electromagnetic waves in accordance with various aspects described herein.
• FIG. 26 is a block diagram of an example, non-limiting embodiment of a computing environment in accordance with various aspects described herein.
• FIG. 27 is a block diagram of an example, non-limiting embodiment of a mobile network platform in accordance with various aspects described herein.
• FIG. 28 is a block diagram of an example, non-limiting embodiment of a communication device in accordance with various aspects described herein.
DETAILED DESCRIPTION
• One or more embodiments are now described with reference to the drawings, wherein like reference numerals are used to refer to like elements throughout. In the following description, for purposes of explanation, numerous details are set forth in order to provide a thorough understanding of the various embodiments. It is evident, however, that the various embodiments can be practiced without these details (and without applying to any particular networked environment or standard).
• In an embodiment, a guided wave communication system is presented for sending and receiving communication signals such as data or other signaling via guided electromagnetic waves. The guided electromagnetic waves include, for example, surface waves or other electromagnetic waves that are bound to or guided by a transmission medium. It will be appreciated that a variety of transmission media can be utilized with guided wave communications without departing from example embodiments. Examples of such transmission media can include one or more of the following, either alone or in one or more combinations: wires, whether insulated or not, and whether single-stranded or multi-stranded; conductors of other shapes or configurations including wire bundles, cables, rods, rails, pipes; non-conductors such as dielectric pipes, rods, rails, or other dielectric members; combinations of conductors and dielectric materials; or other guided wave transmission media.
• The inducement of guided electromagnetic waves on a transmission medium can be independent of any electrical potential, charge or current that is injected or otherwise transmitted through the transmission medium as part of an electrical circuit. For example, in the case where the transmission medium is a wire, it is to be appreciated that while a small current in the wire may be formed in response to the propagation of the guided waves along the wire, this can be due to the propagation of the electromagnetic wave along the wire surface, and is not formed in response to electrical potential, charge or current that is injected into the wire as part of an electrical circuit. The electromagnetic waves traveling on the wire therefore do not require a circuit to propagate along the wire surface. The wire therefore is a single wire transmission line that is not part of a circuit. Also, in some embodiments, a wire is not necessary, and the electromagnetic waves can propagate along a single line transmission medium that is not a wire.
• More generally, “guided electromagnetic waves” or “guided waves” as described by the subject disclosure are affected by the presence of a physical object that is at least a part of the transmission medium (e.g., a bare wire or other conductor, a dielectric, an insulated wire, a conduit or other hollow element, a bundle of insulated wires that is coated, covered or surrounded by a dielectric or insulator or other wire bundle, or another form of solid or otherwise non-liquid or non-gaseous transmission medium) so as to be at least partially bound to or guided by the physical object and so as to propagate along a transmission path of the physical object. Such a physical object can operate as at least a part of a transmission medium that guides, by way of an interface of the transmission medium (e.g., an outer surface, inner surface, an interior portion between the outer and the inner surfaces or other boundary between elements of the transmission medium), the propagation of guided electromagnetic waves, which in turn can carry energy, data and/or other signals along the transmission path from a sending device to a receiving device.
• Unlike free space propagation of wireless signals such as unguided (or unbounded) electromagnetic waves that decrease in intensity inversely by the square of the distance traveled by the unguided electromagnetic waves, guided electromagnetic waves can propagate along a transmission medium with less loss in magnitude per unit distance than experienced by unguided electromagnetic waves.
• An electrical circuit allows electrical signals to propagate from a sending device to a receiving device via a forward electrical path and a return electrical path, respectively. These electrical forward and return paths can be implemented via two conductors, such as two wires or a single wire and a common ground that serves as the second conductor. In particular, electrical current from the sending device (direct and/or alternating) flows through the electrical forward path and returns to the transmission source via the electrical return path as an opposing current. More particularly, electron flow in one conductor that flows away from the sending device, returns to the receiving device in the opposite direction via a second conductor or ground. Unlike electrical signals, guided electromagnetic waves can propagate along a transmission medium (e.g., a bare conductor, an insulated conductor, a conduit, a non-conducting material such as a dielectric strip, or any other type of object suitable for the propagation of surface waves) from a sending device to a receiving device or vice-versa without requiring the transmission medium to be part of an electrical circuit (i.e., without requiring an electrical return path) between the sending device and the receiving device. Although electromagnetic waves can propagate in an open circuit, i.e., a circuit without an electrical return path or with a break or gap that prevents the flow of electrical current through the circuit, it is noted that electromagnetic waves can also propagate along a surface of a transmission medium that is in fact part of an electrical circuit. That is electromagnetic waves can travel along a first surface of a transmission medium having a forward electrical path and/or along a second surface of a transmission medium having an electrical return path. As a consequence, guided electromagnetic waves can propagate along a surface of a transmission medium from a sending device to a receiving device or vice-versa with or without an electrical circuit.
• This permits, for example, transmission of guided electromagnetic waves along a transmission medium having no conductive components (e.g., a dielectric strip). This also permits, for example, transmission of guided electromagnetic waves that propagate along a transmission medium having no more than a single conductor (e.g., an electromagnetic wave that propagates along the surface of a single bare conductor or along the surface of a single insulated conductor or an electromagnetic wave that propagates all or partly within the insulation of an insulated conductor). Even if a transmission medium includes one or more conductive components and the guided electromagnetic waves propagating along the transmission medium generate currents that, at times, flow in the one or more conductive components in a direction of the guided electromagnetic waves, such guided electromagnetic waves can propagate along the transmission medium from a sending device to a receiving device without a flow of an opposing current on an electrical return path back to the sending device from the receiving device. As a consequence, the propagation of such guided electromagnetic waves can be referred to as propagating via a single transmission line or propagating via a surface wave transmission line.
• In a non-limiting illustration, consider a coaxial cable having a center conductor and a ground shield that are separated by an insulator. Typically, in an electrical system a first terminal of a sending (and receiving) device can be connected to the center conductor, and a second terminal of the sending (and receiving) device can be connected to the ground shield. If the sending device injects an electrical signal in the center conductor via the first terminal, the electrical signal will propagate along the center conductor causing, at times, forward currents and a corresponding flow of electrons in the center conductor, and return currents and an opposing flow of electrons in the ground shield. The same conditions apply for a two terminal receiving device.
• In contrast, consider a guided wave communication system such as described in the subject disclosure, which can utilize different embodiments of a transmission medium (including among others a coaxial cable) for transmitting and receiving guided electromagnetic waves without an electrical circuit (i.e., without an electrical forward path or electrical return path depending on your perspective). In one embodiment, for example, the guided wave communication system of the subject disclosure can be configured to induce guided electromagnetic waves that propagate along an outer surface of a coaxial cable (e.g., the outer jacket or insulation layer of the coaxial cable). Although the guided electromagnetic waves will cause forward currents on the ground shield, the guided electromagnetic waves do not require return currents in the center conductor to enable the guided electromagnetic waves to propagate along the outer surface of the coaxial cable. Said another way, while the guided electromagnetic waves will cause forward currents on the ground shield, the guided electromagnetic waves will not generate opposing return currents in the center conductor (or other electrical return path). The same can be said of other transmission media used by a guided wave communication system for the transmission and reception of guided electromagnetic waves.
• For example, guided electromagnetic waves induced by the guided wave communication system on an outer surface of a bare conductor, or an insulated conductor can propagate along the outer surface of the bare conductor or the other surface of the insulated conductor without generating opposing return currents in an electrical return path. As another point of differentiation, where the majority of the signal energy in an electrical circuit is induced by the flow of electrons in the conductors themselves, guided electromagnetic waves propagating in a guided wave communication system on an outer surface of a bare conductor, cause only minimal forward currents in the bare conductor, with the majority of the signal energy of the electromagnetic wave concentrated above the outer surface of the bare conductor and not inside the bare conductor. Furthermore, guided electromagnetic waves that are bound to the outer surface of an insulated conductor cause only minimal forward currents in the center conductor or conductors of the insulated conductor, with the majority of the signal energy of the electromagnetic wave concentrated in regions inside the insulation and/or above the outside surface of the insulated conductor—in other words, the majority of the signal energy of the electromagnetic wave is concentrated outside the center conductor(s) of the insulated conductor.
• Consequently, electrical systems that require two or more conductors for carrying forward and reverse currents on separate conductors to enable the propagation of electrical signals injected by a sending device are distinct from guided wave systems that induce guided electromagnetic waves on an interface of a transmission medium without the need of an electrical circuit to enable the propagation of the guided electromagnetic waves along the interface of the transmission medium.
• It is further noted that guided electromagnetic waves as described in the subject disclosure can have an electromagnetic field structure that lies primarily or substantially outside of a transmission medium so as to be bound to or guided by the transmission medium and so as to propagate non-trivial distances on or along an outer surface of the transmission medium. In other embodiments, guided electromagnetic waves can have an electromagnetic field structure that lies primarily or substantially inside a transmission medium so as to be bound to or guided by the transmission medium and so as to propagate non-trivial distances within the transmission medium. In other embodiments, guided electromagnetic waves can have an electromagnetic field structure that lies partially inside and partially outside a transmission medium so as to be bound to or guided by the transmission medium and so as to propagate non-trivial distances along the transmission medium. The desired electronic field structure in an embodiment may vary based upon a variety of factors, including the desired transmission distance, the characteristics of the transmission medium itself, and environmental conditions/characteristics outside of the transmission medium (e.g., presence of rain, fog, atmospheric conditions, etc.).
• Various embodiments described herein relate to coupling devices, that can be referred to as “waveguide coupling devices”, “waveguide couplers” or more simply as “couplers”, “coupling devices” or “launchers” for launching and/or extracting guided electromagnetic waves to and from a transmission medium at millimeter-wave frequencies (e.g., 30 to 300 GHz), wherein the wavelength can be small compared to one or more dimensions of the coupling device and/or the transmission medium such as the circumference of a wire or other cross sectional dimension, or lower microwave frequencies such as 300 MHz to 30 GHz. Transmissions can be generated to propagate as waves guided by a coupling device, such as: a strip, arc or other length of dielectric material; a horn, monopole, rod, slot or other antenna; an array of antennas; a magnetic resonant cavity, or other resonant coupler; a coil, a strip line, a waveguide or other coupling device. In operation, the coupling device receives an electromagnetic wave from a transmitter or transmission medium. The electromagnetic field structure of the electromagnetic wave can be carried inside the coupling device, outside the coupling device or some combination thereof. When the coupling device is in close proximity to a transmission medium, at least a portion of an electromagnetic wave couples to or is bound to the transmission medium, and continues to propagate as guided electromagnetic waves. In a reciprocal fashion, a coupling device can extract guided waves from a transmission medium and transfer these electromagnetic waves to a receiver.
• According to an example embodiment, a surface wave is a type of guided wave that is guided by a surface of a transmission medium, such as an exterior or outer surface of the wire, or another surface of the wire that is adjacent to or exposed to another type of medium having different properties (e.g., dielectric properties). Indeed, in an example embodiment, a surface of the wire that guides a surface wave can represent a transitional surface between two different types of media. For example, in the case of a bare or uninsulated wire, the surface of the wire can be the outer or exterior conductive surface of the bare or uninsulated wire that is exposed to air or free space. As another example, in the case of insulated wire, the surface of the wire can be the conductive portion of the wire that meets the insulator portion of the wire, or can otherwise be the insulator surface of the wire that is exposed to air or free space, or can otherwise be any material region between the insulator surface of the wire and the conductive portion of the wire that meets the insulator portion of the wire, depending upon the relative differences in the properties (e.g., dielectric properties) of the insulator, air, and/or the conductor and further dependent on the frequency and propagation mode or modes of the guided wave.
• According to an example embodiment, the term “about” a wire or other transmission medium used in conjunction with a guided wave can include fundamental guided wave propagation modes such as a guided waves having a circular or substantially circular field distribution, a symmetrical electromagnetic field distribution (e.g., electric field, magnetic field, electromagnetic field, etc.) or other fundamental mode pattern at least partially around a wire or other transmission medium. In addition, when a guided wave propagates “about” a wire or other transmission medium, it can do so according to a guided wave propagation mode that includes not only the fundamental wave propagation modes (e.g., zero order modes), but additionally or alternatively non-fundamental wave propagation modes such as higher-order guided wave modes (e.g., 1^storder modes, 2^ndorder modes, etc.), asymmetrical modes and/or other guided (e.g., surface) waves that have non-circular field distributions around a wire or other transmission medium. As used herein, the term “guided wave mode” refers to a guided wave propagation mode of a transmission medium, coupling device or other system component of a guided wave communication system.
• For example, such non-circular field distributions can be unilateral or multi-lateral with one or more axial lobes characterized by relatively higher field strength and/or one or more nulls or null regions characterized by relatively low-field strength, zero-field strength or substantially zero-field strength. Further, the field distribution can otherwise vary as a function of azimuthal orientation around the wire such that one or more angular regions around the wire have an electric or magnetic field strength (or combination thereof) that is higher than one or more other angular regions of azimuthal orientation, according to an example embodiment. It will be appreciated that the relative orientations or positions of the guided wave higher order modes or asymmetrical modes can vary as the guided wave travels along the wire.
• As used herein, the term “millimeter-wave” can refer to electromagnetic waves/signals that fall within the “millimeter-wave frequency band” of 30 GHz to 300 GHz. The term “microwave” can refer to electromagnetic waves/signals that fall within a “microwave frequency band” of 300 MHz to 300 GHz. The term “radio frequency” or “RF” can refer to electromagnetic waves/signals that fall within the “radio frequency band” of 10 kHz to 1 THz. It is appreciated that wireless signals, electrical signals, and guided electromagnetic waves as described in the subject disclosure can be configured to operate at any desirable frequency range, such as, for example, at frequencies within, above or below millimeter-wave and/or microwave frequency bands. In particular, when a coupling device or transmission medium includes a conductive element, the frequency of the guided electromagnetic waves that are carried by the coupling device and/or propagate along the transmission medium can be below the mean collision frequency of the electrons in the conductive element. Further, the frequency of the guided electromagnetic waves that are carried by the coupling device and/or propagate along the transmission medium can be a non-optical frequency, e.g., a radio frequency below the range of optical frequencies that begins at 1 THz.
• As used herein, the term “antenna” can refer to a device that is part of a transmitting or receiving system to transmit/radiate or receive wireless signals.
• In accordance with one or more embodiments, a method can include receiving a plurality of communication signals, and generating, by a transmitting device according to the plurality of communication signals, a plurality of wireless signals that induces a plurality of electromagnetic waves that propagates along a dielectric layer of an uninsulated conductor, wherein the dielectric layer is formed by a physical structure of an outer surface of the uninsulated conductor, wherein the plurality of electromagnetic waves propagates along the dielectric layer of the uninsulated conductor without an electrical return path, and wherein each electromagnetic wave of the plurality of electromagnetic waves conveys at least a portion of the plurality of communication signals.
• In accordance with one or more embodiments, a launcher can include a generator, and a circuit coupled to the generator. The circuit can performs operations including receiving a communication signal, and generating, by the generator according to the communication signal, an electromagnetic wave that couples onto a dielectric layer of a conductor, wherein the dielectric layer is formed by a physical structure of an outer surface of the conductor, wherein the electromagnetic wave propagates along the dielectric layer of the conductor without an electrical return path, and wherein the electromagnetic wave conveys the communication signal.
• In accordance with one or more embodiments, a device includes means for receiving a communication signal, and means for inducing, according to the communication signal, an electromagnetic wave that propagates along a dielectric layer of a conductor, wherein the dielectric layer is formed by a physical structure of an outer surface of the conductor, wherein the electromagnetic wave propagates along the dielectric layer of the conductor without an electrical return path, and wherein the electromagnetic wave conveys the communication signal.
• Referring now toFIG. 1, a block diagram100 illustrating an example, non-limiting embodiment of a guided wave communications system is shown. In operation, atransmission device101 receives one ormore communication signals110 from a communication network or other communications device that includes data and generates guidedwaves120 to convey the data via thetransmission medium125 to the transmission device102. The transmission device102 receives the guidedwaves120 and converts them tocommunication signals112 that include the data for transmission to a communications network or other communications device. The guided waves120 can be modulated to convey data via a modulation technique such as phase shift keying, frequency shift keying, quadrature amplitude modulation, amplitude modulation, multi-carrier modulation such as orthogonal frequency division multiplexing and via multiple access techniques such as frequency division multiplexing, time division multiplexing, code division multiplexing, multiplexing via differing wave propagation modes and via other modulation and access strategies.
• The communication network or networks can include a wireless communication network such as a mobile data network, a cellular voice and data network, a wireless local area network (e.g., WiFi or an 802.xx network), a satellite communications network, a personal area network or other wireless network. The communication network or networks can also include a wired communication network such as a telephone network, an Ethernet network, a local area network, a wide area network such as the Internet, a broadband access network, a cable network, a fiber optic network, or other wired network. The communication devices can include a network edge device, bridge device or home gateway, a set-top box, broadband modem, telephone adapter, access point, base station, or other fixed communication device, a mobile communication device such as an automotive gateway or automobile, laptop computer, tablet, smartphone, cellular telephone, or other communication device.
• In an example embodiment, the guidedwave communication system100 can operate in a bi-directional fashion where transmission device102 receives one ormore communication signals112 from a communication network or device that includes other data and generates guidedwaves122 to convey the other data via thetransmission medium125 to thetransmission device101. In this mode of operation, thetransmission device101 receives the guidedwaves122 and converts them tocommunication signals110 that include the other data for transmission to a communications network or device. The guided waves122 can be modulated to convey data via a modulation technique such as phase shift keying, frequency shift keying, quadrature amplitude modulation, amplitude modulation, multi-carrier modulation such as orthogonal frequency division multiplexing and via multiple access techniques such as frequency division multiplexing, time division multiplexing, code division multiplexing, multiplexing via differing wave propagation modes and via other modulation and access strategies.
• Thetransmission medium125 can include a cable having at least one inner portion surrounded by a dielectric material such as an insulator or other dielectric cover, coating or other dielectric material, the dielectric material having an outer surface and a corresponding circumference. In an example embodiment, thetransmission medium125 operates as a single-wire transmission line to guide the transmission of an electromagnetic wave. When thetransmission medium125 is implemented as a single wire transmission system, it can include a wire. The wire can be insulated or uninsulated, and single-stranded or multi-stranded (e.g., braided). In other embodiments, thetransmission medium125 can contain conductors of other shapes or configurations including wire bundles, cables, rods, rails, pipes. In addition, thetransmission medium125 can include non-conductors such as dielectric pipes, rods, rails, or other dielectric members; combinations of conductors and dielectric materials, conductors without dielectric materials or other guided wave transmission media. It should be noted that thetransmission medium125 can otherwise include any of the transmission media previously discussed.
• Further, as previously discussed, the guidedwaves120 and122 can be contrasted with radio transmissions over free space/air or conventional propagation of electrical power or signals through the conductor of a wire via an electrical circuit. In addition to the propagation of guidedwaves120 and122, thetransmission medium125 may optionally contain one or more wires that propagate electrical power or other communication signals in a conventional manner as a part of one or more electrical circuits.
• Referring now toFIG. 2, a block diagram200 illustrating an example, non-limiting embodiment of a transmission device is shown. Thetransmission device101 or102 includes a communications interface (I/F)205, atransceiver210 and acoupler220.
• In an example of operation, thecommunications interface205 receives acommunication signal110 or112 that includes data. In various embodiments, thecommunications interface205 can include a wireless interface for receiving a wireless communication signal in accordance with a wireless standard protocol such as LTE or other cellular voice and data protocol, WiFi or an 802.11 protocol, WIMAX protocol, Ultra Wideband protocol, Bluetooth protocol, Zigbee protocol, a direct broadcast satellite (DBS) or other satellite communication protocol or other wireless protocol. In addition or in the alternative, thecommunications interface205 includes a wired interface that operates in accordance with an Ethernet protocol, universal serial bus (USB) protocol, a data over cable service interface specification (DOCSIS) protocol, a digital subscriber line (DSL) protocol, a Firewire (IEEE 1394) protocol, or other wired protocol. In additional to standards-based protocols, thecommunications interface205 can operate in conjunction with other wired or wireless protocol. In addition, thecommunications interface205 can optionally operate in conjunction with a protocol stack that includes multiple protocol layers including a MAC protocol, transport protocol, application protocol, etc.
• In an example of operation, thetransceiver210 generates an electromagnetic wave based on thecommunication signal110 or112 to convey the data. The electromagnetic wave has at least one carrier frequency and at least one corresponding wavelength. The carrier frequency can be within a millimeter-wave frequency band of 30 GHz-300 GHz, such as 60 GHz or a carrier frequency in the range of 30-40 GHz or a lower frequency band of 300 MHz-30 GHz in the microwave frequency range such as 26-30 GHz, 11 GHz, 6 GHz or 3 GHz, but it will be appreciated that other carrier frequencies are possible in other embodiments. In one mode of operation, thetransceiver210 merely upconverts the communications signal or signals110 or112 for transmission of the electromagnetic signal in the microwave or millimeter-wave band as a guided electromagnetic wave that is guided by or bound to thetransmission medium125. In another mode of operation, thecommunications interface205 either converts thecommunication signal110 or112 to a baseband or near baseband signal or extracts the data from thecommunication signal110 or112 and thetransceiver210 modulates a high-frequency carrier with the data, the baseband or near baseband signal for transmission. It should be appreciated that thetransceiver210 can modulate the data received via thecommunication signal110 or112 to preserve one or more data communication protocols of thecommunication signal110 or112 either by encapsulation in the payload of a different protocol or by simple frequency shifting. In the alternative, thetransceiver210 can otherwise translate the data received via thecommunication signal110 or112 to a protocol that is different from the data communication protocol or protocols of thecommunication signal110 or112.
• In an example of operation, thecoupler220 couples the electromagnetic wave to thetransmission medium125 as a guided electromagnetic wave to convey the communications signal or signals110 or112. While the prior description has focused on the operation of thetransceiver210 as a transmitter, thetransceiver210 can also operate to receive electromagnetic waves that convey other data from the single wire transmission medium via thecoupler220 and to generatecommunications signals110 or112, viacommunications interface205 that includes the other data. Consider embodiments where an additional guided electromagnetic wave conveys other data that also propagates along thetransmission medium125. Thecoupler220 can also couple this additional electromagnetic wave from thetransmission medium125 to thetransceiver210 for reception.
• Thetransmission device101 or102 includes anoptional training controller230. In an example embodiment, thetraining controller230 is implemented by a standalone processor or a processor that is shared with one or more other components of thetransmission device101 or102. Thetraining controller230 selects the carrier frequencies, modulation schemes and/or guided wave modes for the guided electromagnetic waves based on feedback data received by thetransceiver210 from at least one remote transmission device coupled to receive the guided electromagnetic wave.
• In an example embodiment, a guided electromagnetic wave transmitted by aremote transmission device101 or102 conveys data that also propagates along thetransmission medium125. The data from theremote transmission device101 or102 can be generated to include the feedback data. In operation, thecoupler220 also couples the guided electromagnetic wave from thetransmission medium125 and the transceiver receives the electromagnetic wave and processes the electromagnetic wave to extract the feedback data.
• In an example embodiment, thetraining controller230 operates based on the feedback data to evaluate a plurality of candidate frequencies, modulation schemes and/or transmission modes to select a carrier frequency, modulation scheme and/or transmission mode to enhance performance, such as throughput, signal strength, reduce propagation loss, etc.
• Consider the following example: atransmission device101 begins operation under control of thetraining controller230 by sending a plurality of guided waves as test signals such as pilot waves or other test signals at a corresponding plurality of candidate frequencies and/or candidate modes directed to a remote transmission device102 coupled to thetransmission medium125. The guided waves can include, in addition or in the alternative, test data. The test data can indicate the particular candidate frequency and/or guide-wave mode of the signal. In an embodiment, thetraining controller230 at the remote transmission device102 receives the test signals and/or test data from any of the guided waves that were properly received and determines the best candidate frequency and/or guided wave mode, a set of acceptable candidate frequencies and/or guided wave modes, or a rank ordering of candidate frequencies and/or guided wave modes. This selection of candidate frequenc(ies) or/and guided-mode(s) are generated by thetraining controller230 based on one or more optimizing criteria such as received signal strength, bit error rate, packet error rate, signal to noise ratio, propagation loss, etc. Thetraining controller230 generates feedback data that indicates the selection of candidate frequenc(ies) or/and guided wave mode(s) and sends the feedback data to thetransceiver210 for transmission to thetransmission device101. Thetransmission device101 and102 can then communicate data with one another based on the selection of candidate frequenc(ies) or/and guided wave mode(s).
• In other embodiments, the guided electromagnetic waves that contain the test signals and/or test data are reflected back, repeated back or otherwise looped back by the remote transmission device102 to thetransmission device101 for reception and analysis by thetraining controller230 of thetransmission device101 that initiated these waves. For example, thetransmission device101 can send a signal to the remote transmission device102 to initiate a test mode where a physical reflector is switched on the line, a termination impedance is changed to cause reflections, a loop back mode is switched on to couple electromagnetic waves back to the source transmission device102, and/or a repeater mode is enabled to amplify and retransmit the electromagnetic waves back to the source transmission device102. Thetraining controller230 at the source transmission device102 receives the test signals and/or test data from any of the guided waves that were properly received and determines selection of candidate frequenc(ies) or/and guided wave mode(s).
• While the procedure above has been described in a start-up or initialization mode of operation, eachtransmission device101 or102 can send test signals, evaluate candidate frequencies or guided wave modes via non-test such as normal transmissions or otherwise evaluate candidate frequencies or guided wave modes at other times or continuously as well. In an example embodiment, the communication protocol between thetransmission devices101 and102 can include an on-request or periodic test mode where either full testing or more limited testing of a subset of candidate frequencies and guided wave modes are tested and evaluated. In other modes of operation, the re-entry into such a test mode can be triggered by a degradation of performance due to a disturbance, weather conditions, etc. In an example embodiment, the receiver bandwidth of thetransceiver210 is either sufficiently wide or swept to receive all candidate frequencies or can be selectively adjusted by thetraining controller230 to a training mode where the receiver bandwidth of thetransceiver210 is sufficiently wide or swept to receive all candidate frequencies.
• Referring now toFIG. 3, a graphical diagram300 illustrating an example, non-limiting embodiment of an electromagnetic field distribution is shown. In this embodiment, atransmission medium125 in air includes aninner conductor301 and an insulatingjacket302 of dielectric material, as shown in cross section. The diagram300 includes different gray-scales that represent differing electromagnetic field strengths generated by the propagation of the guided wave having an asymmetrical and non-fundamental guided wave mode.
• In particular, the electromagnetic field distribution corresponds to a modal “sweet spot” that enhances guided electromagnetic wave propagation along an insulated transmission medium and reduces end-to-end transmission loss. In this particular mode, electromagnetic waves are guided by thetransmission medium125 to propagate along an outer surface of the transmission medium—in this case, the outer surface of the insulatingjacket302. Electromagnetic waves are partially embedded in the insulator and partially radiating on the outer surface of the insulator. In this fashion, electromagnetic waves are “lightly” coupled to the insulator so as to enable electromagnetic wave propagation at long distances with low propagation loss.
• As shown, the guided wave has a field structure that lies primarily or substantially outside of thetransmission medium125 that serves to guide the electromagnetic waves. The regions inside theconductor301 have little or no field. Likewise regions inside the insulatingjacket302 have low field strength. The majority of the electromagnetic field strength is distributed in thelobes304 at the outer surface of the insulatingjacket302 and in close proximity thereof. The presence of an asymmetric guided wave mode is shown by the high electromagnetic field strengths at the top and bottom of the outer surface of the insulating jacket302 (in the orientation of the diagram)—as opposed to very small field strengths on the other sides of the insulatingjacket302.
• The example shown corresponds to a 38 GHz electromagnetic wave guided by a wire with a diameter of 1.1 cm and a dielectric insulation of thickness of 0.36 cm. Because the electromagnetic wave is guided by thetransmission medium125 and the majority of the field strength is concentrated in the air outside of the insulatingjacket302 within a limited distance of the outer surface, the guided wave can propagate longitudinally down thetransmission medium125 with very low loss. In the example shown, this “limited distance” corresponds to a distance from the outer surface that is less than half the largest cross sectional dimension of thetransmission medium125. In this case, the largest cross sectional dimension of the wire corresponds to the overall diameter of 1.82 cm, however, this value can vary with the size and shape of thetransmission medium125. For example, should thetransmission medium125 be of a rectangular shape with a height of 0.3 cm and a width of 0.4 cm, the largest cross sectional dimension would be the diagonal of 0.5 cm and the corresponding limited distance would be 0.25 cm. The dimensions of the area containing the majority of the field strength also vary with the frequency, and in general, increase as carrier frequencies decrease.
• It should also be noted that the components of a guided wave communication system, such as couplers and transmission media can have their own cut-off frequencies for each guided wave mode. The cut-off frequency generally sets forth the lowest frequency that a particular guided wave mode is designed to be supported by that particular component. In an example embodiment, the particular asymmetric mode of propagation shown is induced on thetransmission medium125 by an electromagnetic wave having a frequency that falls within a limited range (such as Fc to 2Fc) of the lower cut-off frequency Fc for this particular asymmetric mode. The lower cut-off frequency Fc is particular to the characteristics oftransmission medium125. For embodiments as shown that include aninner conductor301 surrounded by an insulatingjacket302, this cutoff frequency can vary based on the dimensions and properties of the insulatingjacket302 and potentially the dimensions and properties of theinner conductor301 and can be determined experimentally to have a desired mode pattern. It should be noted however, that similar effects can be found for a hollow dielectric or insulator without an inner conductor. In this case, the cutoff frequency can vary based on the dimensions and properties of the hollow dielectric or insulator.
• At frequencies lower than the lower cut-off frequency, the asymmetric mode is difficult to induce in thetransmission medium125 and fails to propagate for all but trivial distances. As the frequency increases above the limited range of frequencies about the cut-off frequency, the asymmetric mode shifts more and more inward of the insulatingjacket302. At frequencies much larger than the cut-off frequency, the field strength is no longer concentrated outside of the insulating jacket, but primarily inside of the insulatingjacket302. While thetransmission medium125 provides strong guidance to the electromagnetic wave and propagation is still possible, ranges are more limited by increased losses due to propagation within the insulatingjacket302—as opposed to the surrounding air.
• Referring now toFIG. 4, a graphical diagram400 illustrating an example, non-limiting embodiment of an electromagnetic field distribution is shown. In particular, a cross section diagram400, similar toFIG. 3 is shown with common reference numerals used to refer to similar elements. The example shown corresponds to a 60 GHz wave guided by a wire with a diameter of 1.1 cm and a dielectric insulation of thickness of 0.36 cm. Because the frequency of the guided wave is above the limited range of the cut-off frequency of this particular asymmetric mode, much of the field strength has shifted inward of the insulatingjacket302. In particular, the field strength is concentrated primarily inside of the insulatingjacket302. While thetransmission medium125 provides strong guidance to the electromagnetic wave and propagation is still possible, ranges are more limited when compared with the embodiment ofFIG. 3, by increased losses due to propagation within the insulatingjacket302.
• Referring now toFIG. 5A, a graphical diagram illustrating an example, non-limiting embodiment of a frequency response is shown. In particular, diagram500 presents a graph of end-to-end loss (in dB) as a function of frequency, overlaid withelectromagnetic field distributions510,520 and530 at three points for a 200 cm insulated medium voltage wire. The boundary between the insulator and the surrounding air is represented byreference numeral525 in each electromagnetic field distribution.
• As discussed in conjunction withFIG. 3, an example of a desired asymmetric mode of propagation shown is induced on thetransmission medium125 by an electromagnetic wave having a frequency that falls within a limited range (such as Fc to 2Fc) of the lower cut-off frequency Fc of the transmission medium for this particular asymmetric mode. In particular, the electromagnetic field distribution520 at 6 GHz falls within this modal “sweet spot” that enhances electromagnetic wave propagation along an insulated transmission medium and reduces end-to-end transmission loss. In this particular mode, guided waves are partially embedded in the insulator and partially radiating on the outer surface of the insulator. In this fashion, the electromagnetic waves are “lightly” coupled to the insulator so as to enable guided electromagnetic wave propagation at long distances with low propagation loss.
• At lower frequencies represented by the electromagnetic field distribution510 at 3 GHz, the asymmetric mode radiates more heavily generating higher propagation losses. At higher frequencies represented by theelectromagnetic field distribution530 at 9 GHz, the asymmetric mode shifts more and more inward of the insulating jacket providing too much absorption, again generating higher propagation losses.
• Referring now toFIG. 5B, a graphical diagram550 illustrating example, non-limiting embodiments of a longitudinal cross-section of atransmission medium125, such as an insulated wire, depicting fields of guided electromagnetic waves at various operating frequencies is shown. As shown in diagram556, when the guided electromagnetic waves are at approximately the cutoff frequency (f_c) corresponding to the modal “sweet spot”, the guided electromagnetic waves are loosely coupled to the insulated wire so that absorption is reduced, and the fields of the guided electromagnetic waves are bound sufficiently to reduce the amount radiated into the environment (e.g., air). Because absorption and radiation of the fields of the guided electromagnetic waves is low, propagation losses are consequently low, enabling the guided electromagnetic waves to propagate for longer distances.
• As shown in diagram554, propagation losses increase when an operating frequency of the guide electromagnetic waves increases above about two-times the cutoff frequency (f_c)—or as referred to, above the range of the “sweet spot”. More of the field strength of the electromagnetic wave is driven inside the insulating layer, increasing propagation losses. At frequencies much higher than the cutoff frequency (f_c) the guided electromagnetic waves are strongly bound to the insulated wire as a result of the fields emitted by the guided electromagnetic waves being concentrated in the insulation layer of the wire, as shown in diagram552. This in turn raises propagation losses further due to absorption of the guided electromagnetic waves by the insulation layer. Similarly, propagation losses increase when the operating frequency of the guided electromagnetic waves is substantially below the cutoff frequency (f_c), as shown in diagram558. At frequencies much lower than the cutoff frequency (f_c) the guided electromagnetic waves are weakly (or nominally) bound to the insulated wire and thereby tend to radiate into the environment (e.g., air), which in turn, raises propagation losses due to radiation of the guided electromagnetic waves.
• Referring now toFIG. 6, a graphical diagram600 illustrating an example, non-limiting embodiment of an electromagnetic field distribution is shown. In this embodiment, atransmission medium602 is a bare wire, as shown in cross section. The diagram300 includes different gray-scales that represent differing electromagnetic field strengths generated by the propagation of a guided wave having a symmetrical and fundamental guided wave mode at a single carrier frequency.
• In this particular mode, electromagnetic waves are guided by thetransmission medium602 to propagate along an outer surface of the transmission medium—in this case, the outer surface of the bare wire. Electromagnetic waves are “lightly” coupled to the wire so as to enable electromagnetic wave propagation at long distances with low propagation loss. As shown, the guided wave has a field structure that lies substantially outside of thetransmission medium602 that serves to guide the electromagnetic waves. The regions inside theconductor602 have little or no field.
• Referring now toFIG. 7, a block diagram700 illustrating an example, non-limiting embodiment of an arc coupler is shown. In particular a coupling device is presented for use in a transmission device, such astransmission device101 or102 presented in conjunction withFIG. 1. The coupling device includes anarc coupler704 coupled to atransmitter circuit712 and termination ordamper714. Thearc coupler704 can be made of a dielectric material, or other low-loss insulator (e.g., Teflon, polyethylene, etc.), or made of a conducting (e.g., metallic, non-metallic, etc.) material, or any combination of the foregoing materials. As shown, thearc coupler704 operates as a waveguide and has awave706 propagating as a guided wave about a waveguide surface of thearc coupler704. In the embodiment shown, at least a portion of thearc coupler704 can be placed near awire702 or other transmission medium, (such as transmission medium125), in order to facilitate coupling between thearc coupler704 and thewire702 or other transmission medium, as described herein to launch the guidedwave708 on the wire. Thearc coupler704 can be placed such that a portion of thecurved arc coupler704 is tangential to, and parallel or substantially parallel to thewire702. The portion of thearc coupler704 that is parallel to the wire can be an apex of the curve, or any point where a tangent of the curve is parallel to thewire702. When thearc coupler704 is positioned or placed thusly, thewave706 travelling along thearc coupler704 couples, at least in part, to thewire702, and propagates as guidedwave708 around or about the wire surface of thewire702 and longitudinally along thewire702. The guidedwave708 can be characterized as a surface wave or other electromagnetic wave that is guided by or bound to thewire702 or other transmission medium.
• A portion of thewave706 that does not couple to thewire702 propagates as awave710 along thearc coupler704. It will be appreciated that thearc coupler704 can be configured and arranged in a variety of positions in relation to thewire702 to achieve a desired level of coupling or non-coupling of thewave706 to thewire702. For example, the curvature and/or length of thearc coupler704 that is parallel or substantially parallel, as well as its separation distance (which can include zero separation distance in an embodiment), to thewire702 can be varied without departing from example embodiments. Likewise, the arrangement ofarc coupler704 in relation to thewire702 may be varied based upon considerations of the respective intrinsic characteristics (e.g., thickness, composition, electromagnetic properties, etc.) of thewire702 and thearc coupler704, as well as the characteristics (e.g., frequency, energy level, etc.) of thewaves706 and708.
• The guidedwave708 stays parallel or substantially parallel to thewire702, even as thewire702 bends and flexes. Bends in thewire702 can increase transmission losses, which are also dependent on wire diameters, frequency, and materials. If the dimensions of thearc coupler704 are chosen for efficient power transfer, most of the power in thewave706 is transferred to thewire702, with little power remaining inwave710. It will be appreciated that the guidedwave708 can still be multi-modal in nature (discussed herein), including having modes that are non-fundamental or asymmetric, while traveling along a path that is parallel or substantially parallel to thewire702, with or without a fundamental transmission mode. In an embodiment, non-fundamental or asymmetric modes can be utilized to minimize transmission losses and/or obtain increased propagation distances.
• It is noted that the term parallel is generally a geometric construct which often is not exactly achievable in real systems. Accordingly, the term parallel as utilized in the subject disclosure represents an approximation rather than an exact configuration when used to describe embodiments disclosed in the subject disclosure. In an embodiment, substantially parallel can include approximations that are within 30 degrees of true parallel in all dimensions.
• In an embodiment, thewave706 can exhibit one or more wave propagation modes. The arc coupler modes can be dependent on the shape and/or design of thecoupler704. The one or more arc coupler modes ofwave706 can generate, influence, or impact one or more wave propagation modes of the guidedwave708 propagating alongwire702. It should be particularly noted however that the guided wave modes present in the guidedwave706 may be the same or different from the guided wave modes of the guidedwave708. In this fashion, one or more guided wave modes of the guidedwave706 may not be transferred to the guidedwave708, and further one or more guided wave modes of guidedwave708 may not have been present in guidedwave706. It should also be noted that the cut-off frequency of thearc coupler704 for a particular guided wave mode may be different than the cutoff frequency of thewire702 or other transmission medium for that same mode. For example, while thewire702 or other transmission medium may be operated slightly above its cutoff frequency for a particular guided wave mode, thearc coupler704 may be operated well above its cut-off frequency for that same mode for low loss, slightly below its cut-off frequency for that same mode to, for example, induce greater coupling and power transfer, or some other point in relation to the arc coupler's cutoff frequency for that mode.
• In an embodiment, the wave propagation modes on thewire702 can be similar to the arc coupler modes since bothwaves706 and708 propagate about the outside of thearc coupler704 andwire702 respectively. In some embodiments, as thewave706 couples to thewire702, the modes can change form, or new modes can be created or generated, due to the coupling between thearc coupler704 and thewire702. For example, differences in size, material, and/or impedances of thearc coupler704 andwire702 may create additional modes not present in the arc coupler modes and/or suppress some of the arc coupler modes. The wave propagation modes can comprise the fundamental transverse electromagnetic mode (Quasi-TEM₀₀), where only small electric and/or magnetic fields extend in the direction of propagation, and the electric and magnetic fields extend radially outwards while the guided wave propagates along the wire. This guided wave mode can be donut shaped, where few of the electromagnetic fields exist within thearc coupler704 orwire702.
• Waves706 and708 can comprise a fundamental TEM mode where the fields extend radially outwards, and also comprise other, non-fundamental (e.g., asymmetric, higher-level, etc.) modes. While particular wave propagation modes are discussed above, other wave propagation modes are likewise possible such as transverse electric (TE) and transverse magnetic (TM) modes, based on the frequencies employed, the design of thearc coupler704, the dimensions and composition of thewire702, as well as its surface characteristics, its insulation if present, the electromagnetic properties of the surrounding environment, etc. It should be noted that, depending on the frequency, the electrical and physical characteristics of thewire702 and the particular wave propagation modes that are generated, guidedwave708 can travel along the conductive surface of an oxidized uninsulated wire, an unoxidized uninsulated wire, an insulated wire and/or along the insulating surface of an insulated wire.
• In an embodiment, a diameter of thearc coupler704 is smaller than the diameter of thewire702. For the millimeter-band wavelength being used, thearc coupler704 supports a single waveguide mode that makes upwave706. This single waveguide mode can change as it couples to thewire702 as guidedwave708. If thearc coupler704 were larger, more than one waveguide mode can be supported, but these additional waveguide modes may not couple to thewire702 as efficiently, and higher coupling losses can result. However, in some alternative embodiments, the diameter of thearc coupler704 can be equal to or larger than the diameter of thewire702, for example, where higher coupling losses are desirable or when used in conjunction with other techniques to otherwise reduce coupling losses (e.g., impedance matching with tapering, etc.).
• In an embodiment, the wavelength of thewaves706 and708 are comparable in size, or smaller than a circumference of thearc coupler704 and thewire702. In an example, if thewire702 has a diameter of 0.5 cm, and a corresponding circumference of around 1.5 cm, the wavelength of the transmission is around 1.5 cm or less, corresponding to a frequency of 70 GHz or greater. In another embodiment, a suitable frequency of the transmission and the carrier-wave signal is in the range of 30-100 GHz, perhaps around 30-60 GHz, and around 38 GHz in one example. In an embodiment, when the circumference of thearc coupler704 andwire702 is comparable in size to, or greater, than a wavelength of the transmission, thewaves706 and708 can exhibit multiple wave propagation modes including fundamental and/or non-fundamental (symmetric and/or asymmetric) modes that propagate over sufficient distances to support various communication systems described herein. Thewaves706 and708 can therefore comprise more than one type of electric and magnetic field configuration. In an embodiment, as the guidedwave708 propagates down thewire702, the electrical and magnetic field configurations will remain the same from end to end of thewire702. In other embodiments, as the guidedwave708 encounters interference (distortion or obstructions) or loses energy due to transmission losses or scattering, the electric and magnetic field configurations can change as the guidedwave708 propagates downwire702.
• In an embodiment, thearc coupler704 can be composed of nylon, Teflon, polyethylene, a polyamide, or other plastics. In other embodiments, other dielectric materials are possible. The wire surface ofwire702 can be metallic with either a bare metallic surface, or can be insulated using plastic, dielectric, insulator or other coating, jacket or sheathing. In an embodiment, a dielectric or otherwise non-conducting/insulated waveguide can be paired with either a bare/metallic wire or insulated wire. In other embodiments, a metallic and/or conductive waveguide can be paired with a bare/metallic wire or insulated wire. In an embodiment, an oxidation layer on the bare metallic surface of the wire702 (e.g., resulting from exposure of the bare metallic surface to oxygen/air) can also provide insulating or dielectric properties similar to those provided by some insulators or sheathings.
• It is noted that the graphical representations ofwaves706,708 and710 are presented merely to illustrate the principles that wave706 induces or otherwise launches a guidedwave708 on awire702 that operates, for example, as a single wire transmission line.Wave710 represents the portion ofwave706 that remains on thearc coupler704 after the generation of guidedwave708. The actual electric and magnetic fields generated as a result of such wave propagation may vary depending on the frequencies employed, the particular wave propagation mode or modes, the design of thearc coupler704, the dimensions and composition of thewire702, as well as its surface characteristics, its optional insulation, the electromagnetic properties of the surrounding environment, etc.
• It is noted thatarc coupler704 can include a termination circuit ordamper714 at the end of thearc coupler704 that can absorb leftover radiation or energy fromwave710. The termination circuit ordamper714 can prevent and/or minimize the leftover radiation or energy fromwave710 reflecting back towardtransmitter circuit712. In an embodiment, the termination circuit ordamper714 can include termination resistors, and/or other components that perform impedance matching to attenuate reflection. In some embodiments, if the coupling efficiencies are high enough, and/or wave710 is sufficiently small, it may not be necessary to use a termination circuit ordamper714. For the sake of simplicity, thesetransmitter712 and termination circuits ordampers714 may not be depicted in the other figures, but in those embodiments, transmitter and termination circuits or dampers may possibly be used.
• Further, while asingle arc coupler704 is presented that generates a single guidedwave708,multiple arc couplers704 placed at different points along thewire702 and/or at different azimuthal orientations about the wire can be employed to generate and receive multiple guidedwaves708 at the same or different frequencies, at the same or different phases, at the same or different wave propagation modes.
• FIG. 8, a block diagram800 illustrating an example, non-limiting embodiment of an arc coupler is shown. In the embodiment shown, at least a portion of thecoupler704 can be placed near awire702 or other transmission medium, (such as transmission medium125), in order to facilitate coupling between thearc coupler704 and thewire702 or other transmission medium, to extract a portion of the guidedwave806 as a guidedwave808 as described herein. Thearc coupler704 can be placed such that a portion of thecurved arc coupler704 is tangential to, and parallel or substantially parallel to thewire702. The portion of thearc coupler704 that is parallel to the wire can be an apex of the curve, or any point where a tangent of the curve is parallel to thewire702. When thearc coupler704 is positioned or placed thusly, thewave806 travelling along thewire702 couples, at least in part, to thearc coupler704, and propagates as guidedwave808 along thearc coupler704 to a receiving device (not expressly shown). A portion of thewave806 that does not couple to the arc coupler propagates aswave810 along thewire702 or other transmission medium.
• In an embodiment, thewave806 can exhibit one or more wave propagation modes. The arc coupler modes can be dependent on the shape and/or design of thecoupler704. The one or more modes of guidedwave806 can generate, influence, or impact one or more guide-wave modes of the guidedwave808 propagating along thearc coupler704. It should be particularly noted however that the guided wave modes present in the guidedwave806 may be the same or different from the guided wave modes of the guidedwave808. In this fashion, one or more guided wave modes of the guidedwave806 may not be transferred to the guidedwave808, and further one or more guided wave modes of guidedwave808 may not have been present in guidedwave806.
• Referring now toFIG. 9A, a block diagram900 illustrating an example, non-limiting embodiment of a stub coupler is shown. In particular a coupling device that includesstub coupler904 is presented for use in a transmission device, such astransmission device101 or102 presented in conjunction withFIG. 1. Thestub coupler904 can be made of a dielectric material, or other low-loss insulator (e.g., Teflon, polyethylene and etc.), or made of a conducting (e.g., metallic, non-metallic, etc.) material, or any combination of the foregoing materials. As shown, thestub coupler904 operates as a waveguide and has awave906 propagating as a guided wave about a waveguide surface of thestub coupler904. In the embodiment shown, at least a portion of thestub coupler904 can be placed near awire702 or other transmission medium, (such as transmission medium125), in order to facilitate coupling between thestub coupler904 and thewire702 or other transmission medium, as described herein to launch the guidedwave908 on the wire.
• In an embodiment, thestub coupler904 is curved, and an end of thestub coupler904 can be tied, fastened, or otherwise mechanically coupled to awire702. When the end of thestub coupler904 is fastened to thewire702, the end of thestub coupler904 is parallel or substantially parallel to thewire702. Alternatively, another portion of the dielectric waveguide beyond an end can be fastened or coupled towire702 such that the fastened or coupled portion is parallel or substantially parallel to thewire702. Thefastener910 can be a nylon cable tie or other type of non-conducting/dielectric material that is either separate from thestub coupler904 or constructed as an integrated component of thestub coupler904. Thestub coupler904 can be adjacent to thewire702 without surrounding thewire702.
• Like thearc coupler704 described in conjunction withFIG. 7, when thestub coupler904 is placed with the end parallel to thewire702, the guidedwave906 travelling along thestub coupler904 couples to thewire702, and propagates as guidedwave908 about the wire surface of thewire702. In an example embodiment, the guidedwave908 can be characterized as a surface wave or other electromagnetic wave.
• It is noted that the graphical representations ofwaves906 and908 are presented merely to illustrate the principles that wave906 induces or otherwise launches a guidedwave908 on awire702 that operates, for example, as a single wire transmission line. The actual electric and magnetic fields generated as a result of such wave propagation may vary depending on one or more of the shape and/or design of the coupler, the relative position of the dielectric waveguide to the wire, the frequencies employed, the design of thestub coupler904, the dimensions and composition of thewire702, as well as its surface characteristics, its optional insulation, the electromagnetic properties of the surrounding environment, etc.
• In an embodiment, an end ofstub coupler904 can taper towards thewire702 in order to increase coupling efficiencies. Indeed, the tapering of the end of thestub coupler904 can provide impedance matching to thewire702 and reduce reflections, according to an example embodiment of the subject disclosure. For example, an end of thestub coupler904 can be gradually tapered in order to obtain a desired level of coupling betweenwaves906 and908 as illustrated inFIG. 9A.
• In an embodiment, thefastener910 can be placed such that there is a short length of thestub coupler904 between thefastener910 and an end of thestub coupler904. Maximum coupling efficiencies are realized in this embodiment when the length of the end of thestub coupler904 that is beyond thefastener910 is at least several wavelengths long for whatever frequency is being transmitted.
• Turning now toFIG. 9B, a diagram950 illustrating an example, non-limiting embodiment of an electromagnetic distribution in accordance with various aspects described herein is shown. In particular, an electromagnetic distribution is presented in two dimensions for a transmission device that includescoupler952, shown in an example stub coupler constructed of a dielectric material. Thecoupler952 couples an electromagnetic wave for propagation as a guided wave along an outer surface of awire702 or other transmission medium.
• Thecoupler952 guides the electromagnetic wave to a junction at x₀via a symmetrical guided wave mode. While some of the energy of the electromagnetic wave that propagates along thecoupler952 is outside of thecoupler952, the majority of the energy of this electromagnetic wave is contained within thecoupler952. The junction at x₀couples the electromagnetic wave to thewire702 or other transmission medium at an azimuthal angle corresponding to the bottom of the transmission medium. This coupling induces an electromagnetic wave that is guided to propagate along the outer surface of thewire702 or other transmission medium via at least one guided wave mode indirection956. The majority of the energy of the guided electromagnetic wave is outside or, but in close proximity to the outer surface of thewire702 or other transmission medium. In the example shown, the junction at x₀forms an electromagnetic wave that propagates via both a symmetrical mode and at least one asymmetrical surface mode, such as the first order mode presented in conjunction withFIG. 3, that skims the surface of thewire702 or other transmission medium.
• It is noted that the graphical representations of guided waves are presented merely to illustrate an example of guided wave coupling and propagation. The actual electric and magnetic fields generated as a result of such wave propagation may vary depending on the frequencies employed, the design and/or configuration of thecoupler952, the dimensions and composition of thewire702 or other transmission medium, as well as its surface characteristics, its insulation if present, the electromagnetic properties of the surrounding environment, etc.
• Turning now toFIG. 10A, illustrated is a block diagram1000 of an example, non-limiting embodiment of a coupler and transceiver system in accordance with various aspects described herein. The system is an example oftransmission device101 or102. In particular, thecommunication interface1008 is an example ofcommunications interface205, thestub coupler1002 is an example ofcoupler220, and the transmitter/receiver device1006,diplexer1016,power amplifier1014, low noise amplifier1018,frequency mixers1010 and1020 andlocal oscillator1012 collectively form an example oftransceiver210.
• In operation, the transmitter/receiver device1006 launches and receives waves (e.g., guidedwave1004 onto stub coupler1002). The guided waves1004 can be used to transport signals received from and sent to a host device, base station, mobile devices, a building or other device by way of acommunications interface1008. Thecommunications interface1008 can be an integral part ofsystem1000. Alternatively, thecommunications interface1008 can be tethered tosystem1000. Thecommunications interface1008 can comprise a wireless interface for interfacing to the host device, base station, mobile devices, a building or other device utilizing any of various wireless signaling protocols (e.g., LTE, WiFi, WiMAX, IEEE 802.xx, etc.) including an infrared protocol such as an infrared data association (IrDA) protocol or other line of sight optical protocol. Thecommunications interface1008 can also comprise a wired interface such as a fiber optic line, coaxial cable, twisted pair, category 5 (CAT-5) cable or other suitable wired or optical mediums for communicating with the host device, base station, mobile devices, a building or other device via a protocol such as an Ethernet protocol, universal serial bus (USB) protocol, a data over cable service interface specification (DOCSIS) protocol, a digital subscriber line (DSL) protocol, a Firewire (IEEE 1394) protocol, or other wired or optical protocol. For embodiments wheresystem1000 functions as a repeater, thecommunications interface1008 may not be necessary.
• The output signals (e.g., Tx) of thecommunications interface1008 can be combined with a carrier wave (e.g., millimeter-wave carrier wave) generated by alocal oscillator1012 atfrequency mixer1010.Frequency mixer1010 can use heterodyning techniques or other frequency shifting techniques to frequency shift the output signals fromcommunications interface1008. For example, signals sent to and from thecommunications interface1008 can be modulated signals such as orthogonal frequency division multiplexed (OFDM) signals formatted in accordance with a Long-Term Evolution (LTE) wireless protocol or other wireless 3G, 4G, 5G or higher voice and data protocol, a Zigbee, WIMAX, UltraWideband or IEEE 802.11 wireless protocol; a wired protocol such as an Ethernet protocol, universal serial bus (USB) protocol, a data over cable service interface specification (DOCSIS) protocol, a digital subscriber line (DSL) protocol, a Firewire (IEEE 1394) protocol or other wired or wireless protocol. In an example embodiment, this frequency conversion can be done in the analog domain, and as a result, the frequency shifting can be done without regard to the type of communications protocol used by a base station, mobile devices, or in-building devices. As new communications technologies are developed, thecommunications interface1008 can be upgraded (e.g., updated with software, firmware, and/or hardware) or replaced and the frequency shifting and transmission apparatus can remain, simplifying upgrades. The carrier wave can then be sent to a power amplifier (“PA”)1014 and can be transmitted via thetransmitter receiver device1006 via thediplexer1016.
• Signals received from the transmitter/receiver device1006 that are directed towards thecommunications interface1008 can be separated from other signals viadiplexer1016. The received signal can then be sent to low noise amplifier (“LNA”)1018 for amplification. A frequency mixer1020, with help fromlocal oscillator1012 can downshift the received signal (which is in the millimeter-wave band or around 38 GHz in some embodiments) to the native frequency. Thecommunications interface1008 can then receive the transmission at an input port (Rx).
• In an embodiment, transmitter/receiver device1006 can include a cylindrical or non-cylindrical metal (which, for example, can be hollow in an embodiment, but not necessarily drawn to scale) or other conducting or non-conducting waveguide and an end of thestub coupler1002 can be placed in or in proximity to the waveguide or the transmitter/receiver device1006 such that when the transmitter/receiver device1006 generates a transmission, the guided wave couples to stubcoupler1002 and propagates as a guidedwave1004 about the waveguide surface of thestub coupler1002. In some embodiments, the guidedwave1004 can propagate in part on the outer surface of thestub coupler1002 and in part inside thestub coupler1002. In other embodiments, the guidedwave1004 can propagate substantially or completely on the outer surface of thestub coupler1002. In yet other embodiments, the guidedwave1004 can propagate substantially or completely inside thestub coupler1002. In this latter embodiment, the guidedwave1004 can radiate at an end of the stub coupler1002 (such as the tapered end shown inFIG. 4) for coupling to a transmission medium such as awire702 ofFIG. 7. Similarly, if guidedwave1004 is incoming (coupled to thestub coupler1002 from a wire702), guidedwave1004 then enters the transmitter/receiver device1006 and couples to the cylindrical waveguide or conducting waveguide. While transmitter/receiver device1006 is shown to include a separate waveguide—an antenna, cavity resonator, klystron, magnetron, travelling wave tube, or other radiating element can be employed to induce a guided wave on thecoupler1002, with or without the separate waveguide.
• In an embodiment,stub coupler1002 can be wholly constructed of a dielectric material (or another suitable insulating material), without any metallic or otherwise conducting materials therein.Stub coupler1002 can be composed of nylon, Teflon, polyethylene, a polyamide, other plastics, or other materials that are non-conducting and suitable for facilitating transmission of electromagnetic waves at least in part on an outer surface of such materials. In another embodiment,stub coupler1002 can include a core that is conducting/metallic, and have an exterior dielectric surface. Similarly, a transmission medium that couples to thestub coupler1002 for propagating electromagnetic waves induced by thestub coupler1002 or for supplying electromagnetic waves to thestub coupler1002 can, in addition to being a bare or insulated wire, be wholly constructed of a dielectric material (or another suitable insulating material), without any metallic or otherwise conducting materials therein.
• It is noted that althoughFIG. 10A shows that the opening oftransmitter receiver device1006 is much wider than thestub coupler1002, this is not to scale, and that in other embodiments the width of thestub coupler1002 is comparable or slightly smaller than the opening of the hollow waveguide. It is also not shown, but in an embodiment, an end of thecoupler1002 that is inserted into the transmitter/receiver device1006 tapers down in order to reduce reflection and increase coupling efficiencies.
• Before coupling to thestub coupler1002, the one or more waveguide modes of the guided wave generated by the transmitter/receiver device1006 can couple to thestub coupler1002 to induce one or more wave propagation modes of the guidedwave1004. The wave propagation modes of the guidedwave1004 can be different than the hollow metal waveguide modes due to the different characteristics of the hollow metal waveguide and the dielectric waveguide. For instance, wave propagation modes of the guidedwave1004 can comprise the fundamental transverse electromagnetic mode (Quasi-TEM₀₀), where only small electrical and/or magnetic fields extend in the direction of propagation, and the electric and magnetic fields extend radially outwards from thestub coupler1002 while the guided waves propagate along thestub coupler1002. The fundamental transverse electromagnetic mode wave propagation mode may or may not exist inside a waveguide that is hollow. Therefore, the hollow metal waveguide modes that are used by transmitter/receiver device1006 are waveguide modes that can couple effectively and efficiently to wave propagation modes ofstub coupler1002.
• It will be appreciated that other constructs or combinations of the transmitter/receiver device1006 andstub coupler1002 are possible. For example, astub coupler1002′ can be placed tangentially or in parallel (with or without a gap) with respect to an outer surface of the hollow metal waveguide of the transmitter/receiver device1006′ (corresponding circuitry not shown) as depicted byreference1000′ ofFIG. 10B. In another embodiment, not shown byreference1000′, thestub coupler1002′ can be placed inside the hollow metal waveguide of the transmitter/receiver device1006′ without an axis of thestub coupler1002′ being coaxially aligned with an axis of the hollow metal waveguide of the transmitter/receiver device1006′. In either of these embodiments, the guided wave generated by the transmitter/receiver device1006′ can couple to a surface of thestub coupler1002′ to induce one or more wave propagation modes of the guidedwave1004′ on thestub coupler1002′ including a fundamental mode (e.g., a symmetric mode) and/or a non-fundamental mode (e.g., asymmetric mode).
• In one embodiment, the guidedwave1004′ can propagate in part on the outer surface of thestub coupler1002′ and in part inside thestub coupler1002′. In another embodiment, the guidedwave1004′ can propagate substantially or completely on the outer surface of thestub coupler1002′. In yet other embodiments, the guidedwave1004′ can propagate substantially or completely inside thestub coupler1002′. In this latter embodiment, the guidedwave1004′ can radiate at an end of thestub coupler1002′ (such as the tapered end shown inFIG. 9) for coupling to a transmission medium such as awire702 ofFIG. 9.
• It will be further appreciated that other constructs the transmitter/receiver device1006 are possible. For example, a hollow metal waveguide of a transmitter/receiver device1006″ (corresponding circuitry not shown), depicted inFIG. 10B asreference1000″, can be placed tangentially or in parallel (with or without a gap) with respect to an outer surface of a transmission medium such as thewire702 ofFIG. 4 without the use of thestub coupler1002. In this embodiment, the guided wave generated by the transmitter/receiver device1006″ can couple to a surface of thewire702 to induce one or more wave propagation modes of a guidedwave908 on thewire702 including a fundamental mode (e.g., a symmetric mode) and/or a non-fundamental mode (e.g., asymmetric mode). In another embodiment, thewire702 can be positioned inside a hollow metal waveguide of a transmitter/receiver device1006′″ (corresponding circuitry not shown) so that an axis of thewire702 is coaxially (or not coaxially) aligned with an axis of the hollow metal waveguide without the use of thestub coupler1002—seeFIG.10B reference1000′″. In this embodiment, the guided wave generated by the transmitter/receiver device1006′″ can couple to a surface of thewire702 to induce one or more wave propagation modes of a guidedwave908 on the wire including a fundamental mode (e.g., a symmetric mode) and/or a non-fundamental mode (e.g., asymmetric mode).
• In the embodiments of1000″ and1000′″, for awire702 having an insulated outer surface, the guidedwave908 can propagate in part on the outer surface of the insulator and in part inside the insulator. In embodiments, the guidedwave908 can propagate substantially or completely on the outer surface of the insulator, or substantially or completely inside the insulator. In the embodiments of1000″ and1000′″, for awire702 that is a bare conductor, the guidedwave908 can propagate in part on the outer surface of the conductor and in part inside the conductor. In another embodiment, the guidedwave908 can propagate substantially or completely on the outer surface of the conductor.
• Referring now toFIG. 11, a block diagram1100 illustrating an example, non-limiting embodiment of a dual stub coupler is shown. In particular, a dual coupler design is presented for use in a transmission device, such astransmission device101 or102 presented in conjunction withFIG. 1. In an embodiment, two or more couplers (such as thestub couplers1104 and1106) can be positioned around awire1102 in order to receive guidedwave1108. In an embodiment, one coupler is enough to receive the guidedwave1108. In that case, guidedwave1108 couples tocoupler1104 and propagates as guidedwave1110. If the field structure of the guidedwave1108 oscillates or undulates around thewire1102 due to the particular guided wave mode(s) or various outside factors, then coupler1106 can be placed such that guidedwave1108 couples tocoupler1106. In some embodiments, four or more couplers can be placed around a portion of thewire1102, e.g., at 90 degrees or another spacing with respect to each other, in order to receive guided waves that may oscillate or rotate around thewire1102, that have been induced at different azimuthal orientations or that have non-fundamental or higher order modes that, for example, have lobes and/or nulls or other asymmetries that are orientation dependent. However, it will be appreciated that there may be less than or more than four couplers placed around a portion of thewire1102 without departing from example embodiments.
• It should be noted that whilecouplers1106 and1104 are illustrated as stub couplers, any other of the coupler designs described herein including arc couplers, antenna or horn couplers, magnetic couplers, etc., could likewise be used. It will also be appreciated that while some example embodiments have presented a plurality of couplers around at least a portion of awire1102, this plurality of couplers can also be considered as part of a single coupler system having multiple coupler subcomponents. For example, two or more couplers can be manufactured as single system that can be installed around a wire in a single installation such that the couplers are either pre-positioned or adjustable relative to each other (either manually or automatically with a controllable mechanism such as a motor or other actuator) in accordance with the single system.
• Receivers coupled tocouplers1106 and1104 can use diversity combining to combine signals received from bothcouplers1106 and1104 in order to maximize the signal quality. In other embodiments, if one or the other of thecouplers1104 and1106 receive a transmission that is above a predetermined threshold, receivers can use selection diversity when deciding which signal to use. Further, while reception by a plurality ofcouplers1106 and1104 is illustrated, transmission bycouplers1106 and1104 in the same configuration can likewise take place. In particular, a wide range of multi-input multi-output (MIMO) transmission and reception techniques can be employed for transmissions where a transmission device, such astransmission device101 or102 presented in conjunction withFIG. 1 includes multiple transceivers and multiple couplers.
• It is noted that the graphical representations ofwaves1108 and1110 are presented merely to illustrate the principles that guidedwave1108 induces or otherwise launches awave1110 on acoupler1104. The actual electric and magnetic fields generated as a result of such wave propagation may vary depending on the frequencies employed, the design of thecoupler1104, the dimensions and composition of thewire1102, as well as its surface characteristics, its insulation if any, the electromagnetic properties of the surrounding environment, etc.
• Referring now toFIG. 12, a block diagram1200 illustrating an example, non-limiting embodiment of a repeater system is shown. In particular, arepeater device1210 is presented for use in a transmission device, such astransmission device101 or102 presented in conjunction withFIG. 1. In this system, twocouplers1204 and1214 can be placed near awire1202 or other transmission medium such that guidedwaves1205 propagating along thewire1202 are extracted bycoupler1204 as wave1206 (e.g. as a guided wave), and then are boosted or repeated byrepeater device1210 and launched as a wave1216 (e.g. as a guided wave) ontocoupler1214. Thewave1216 can then be launched on thewire1202 and continue to propagate along thewire1202 as a guidedwave1217. In an embodiment, therepeater device1210 can receive at least a portion of the power utilized for boosting or repeating through magnetic coupling with thewire1202, for example, when thewire1202 is a power line or otherwise contains a power-carrying conductor. It should be noted that whilecouplers1204 and1214 are illustrated as stub couplers, any other of the coupler designs described herein including arc couplers, antenna or horn couplers, magnetic couplers, or the like, could likewise be used.
• In some embodiments,repeater device1210 can repeat the transmission associated withwave1206, and in other embodiments,repeater device1210 can include acommunications interface205 that extracts data or other signals from thewave1206 for supplying such data or signals to another network and/or one or more other devices as communication signals110 or112 and/or receivingcommunication signals110 or112 from another network and/or one or more other devices and launch guidedwave1216 having embedded therein the receivedcommunication signals110 or112. In a repeater configuration,receiver waveguide1208 can receive thewave1206 from thecoupler1204 andtransmitter waveguide1212 can launch guidedwave1216 ontocoupler1214 as guidedwave1217. Betweenreceiver waveguide1208 andtransmitter waveguide1212, the signal embedded in guidedwave1206 and/or the guidedwave1216 itself can be amplified to correct for signal loss and other inefficiencies associated with guided wave communications or the signal can be received and processed to extract the data contained therein and regenerated for transmission. In an embodiment, thereceiver waveguide1208 can be configured to extract data from the signal, process the data to correct for data errors utilizing for example error correcting codes, and regenerate an updated signal with the corrected data. Thetransmitter waveguide1212 can then transmit guidedwave1216 with the updated signal embedded therein. In an embodiment, a signal embedded in guidedwave1206 can be extracted from the transmission and processed for communication with another network and/or one or more other devices viacommunications interface205 as communication signals110 or112. Similarly, communication signals110 or112 received by thecommunications interface205 can be inserted into a transmission of guidedwave1216 that is generated and launched ontocoupler1214 bytransmitter waveguide1212.
• It is noted that althoughFIG. 12 shows guidedwave transmissions1206 and1216 entering from the left and exiting to the right respectively, this is merely a simplification and is not intended to be limiting. In other embodiments,receiver waveguide1208 andtransmitter waveguide1212 can also function as transmitters and receivers respectively, allowing therepeater device1210 to be bi-directional.
• In an embodiment,repeater device1210 can be placed at locations where there are discontinuities or obstacles on thewire1202 or other transmission medium. In the case where thewire1202 is a power line, these obstacles can include transformers, connections, utility poles, and other such power line devices. Therepeater device1210 can help the guided (e.g., surface) waves jump over these obstacles on the line and boost the transmission power at the same time. In other embodiments, a coupler can be used to jump over the obstacle without the use of a repeater device. In that embodiment, both ends of the coupler can be tied or fastened to the wire, thus providing a path for the guided wave to travel without being blocked by the obstacle.
• Turning now toFIG. 13, illustrated is a block diagram1300 of an example, non-limiting embodiment of a bidirectional repeater in accordance with various aspects described herein. In particular, abidirectional repeater device1306 is presented for use in a transmission device, such astransmission device101 or102 presented in conjunction withFIG. 1. It should be noted that while the couplers are illustrated as stub couplers, any other of the coupler designs described herein including arc couplers, antenna or horn couplers, magnetic couplers, or the like, could likewise be used. Thebidirectional repeater1306 can employ diversity paths in the case of when two or more wires or other transmission media are present. Since guided wave transmissions have different transmission efficiencies and coupling efficiencies for transmission medium of different types such as insulated wires, un-insulated wires or other types of transmission media and further, if exposed to the elements, can be affected by weather, and other atmospheric conditions, it can be advantageous to selectively transmit on different transmission media at certain times. In various embodiments, the various transmission media can be designated as a primary, secondary, tertiary, etc. whether or not such designation indicates a preference of one transmission medium over another.
• In the embodiment shown, the transmission media include an insulated oruninsulated wire1302 and an insulated or uninsulated wire1304 (referred to herein aswires1302 and1304, respectively). Therepeater device1306 uses areceiver coupler1308 to receive a guided wave traveling alongwire1302 and repeats the transmission usingtransmitter waveguide1310 as a guided wave alongwire1304. In other embodiments,repeater device1306 can switch from thewire1304 to thewire1302, or can repeat the transmissions along the same paths.Repeater device1306 can include sensors, or be in communication with sensors (or anetwork management system1601 depicted inFIG. 16A) that indicate conditions that can affect the transmission. Based on the feedback received from the sensors, therepeater device1306 can make the determination about whether to keep the transmission along the same wire, or transfer the transmission to the other wire.
• Turning now toFIG. 14, illustrated is a block diagram1400 illustrating an example, non-limiting embodiment of a bidirectional repeater system. In particular, a bidirectional repeater system is presented for use in a transmission device, such astransmission device101 or102 presented in conjunction withFIG. 1. The bidirectional repeater system includeswaveguide coupling devices1402 and1404 that receive and transmit transmissions from other coupling devices located in a distributed antenna system or backhaul system.
• In various embodiments,waveguide coupling device1402 can receive a transmission from another waveguide coupling device, wherein the transmission has a plurality of subcarriers.Diplexer1406 can separate the transmission from other transmissions, and direct the transmission to low-noise amplifier (“LNA”)1408. Afrequency mixer1428, with help from alocal oscillator1412, can downshift the transmission (which is in the millimeter-wave band or around 38 GHz in some embodiments) to a lower frequency, such as a cellular band (˜1.9 GHz) for a distributed antenna system, a native frequency, or other frequency for a backhaul system. An extractor (or demultiplexer)1432 can extract the signal on a subcarrier and direct the signal to anoutput component1422 for optional amplification, buffering or isolation bypower amplifier1424 for coupling tocommunications interface205. Thecommunications interface205 can further process the signals received from thepower amplifier1424 or otherwise transmit such signals over a wireless or wired interface to other devices such as a base station, mobile devices, a building, etc. For the signals that are not being extracted at this location,extractor1432 can redirect them to anotherfrequency mixer1436, where the signals are used to modulate a carrier wave generated bylocal oscillator1414. The carrier wave, with its subcarriers, is directed to a power amplifier (“PA”)1416 and is retransmitted bywaveguide coupling device1404 to another system, viadiplexer1420.
• AnLNA1426 can be used to amplify, buffer or isolate signals that are received by thecommunication interface205 and then send the signal to amultiplexer1434 which merges the signal with signals that have been received fromwaveguide coupling device1404. The signals received fromcoupling device1404 have been split bydiplexer1420, and then passed throughLNA1418, and downshifted in frequency byfrequency mixer1438. When the signals are combined bymultiplexer1434, they are upshifted in frequency byfrequency mixer1430, and then boosted byPA1410, and transmitted to another system bywaveguide coupling device1402. In an embodiment bidirectional repeater system can be merely a repeater without theoutput device1422. In this embodiment, themultiplexer1434 would not be utilized and signals fromLNA1418 would be directed tomixer1430 as previously described. It will be appreciated that in some embodiments, the bidirectional repeater system could also be implemented using two distinct and separate unidirectional repeaters. In an alternative embodiment, a bidirectional repeater system could also be a booster or otherwise perform retransmissions without downshifting and upshifting. Indeed in example embodiment, the retransmissions can be based upon receiving a signal or guided wave and performing some signal or guided wave processing or reshaping, filtering, and/or amplification, prior to retransmission of the signal or guided wave.
• Referring now toFIG. 15, a block diagram1500 illustrating an example, non-limiting embodiment of a guided wave communications system is shown. This diagram depicts an exemplary environment in which a guided wave communication system, such as the guided wave communication system presented in conjunction withFIG. 1, can be used.
• To provide network connectivity to additional base station devices, a backhaul network that links the communication cells (e.g., macrocells and macrocells) to network devices of a core network correspondingly expands. Similarly, to provide network connectivity to a distributed antenna system, an extended communication system that links base station devices and their distributed antennas is desirable. A guidedwave communication system1500 such as shown inFIG. 15 can be provided to enable alternative, increased or additional network connectivity and a waveguide coupling system can be provided to transmit and/or receive guided wave (e.g., surface wave) communications on a transmission medium such as a wire that operates as a single-wire transmission line (e.g., a utility line), and that can be used as a waveguide and/or that otherwise operates to guide the transmission of an electromagnetic wave.
• The guidedwave communication system1500 can comprise a first instance of adistribution system1550 that includes one or more base station devices (e.g., base station device1504) that are communicably coupled to acentral office1501 and/or amacrocell site1502.Base station device1504 can be connected by a wired (e.g., fiber and/or cable), or by a wireless (e.g., microwave wireless) connection to themacrocell site1502 and thecentral office1501. A second instance of thedistribution system1560 can be used to provide wireless voice and data services tomobile device1522 and to residential and/or commercial establishments1542 (herein referred to as establishments1542).System1500 can have additional instances of thedistribution systems1550 and1560 for providing voice and/or data services to mobile devices1522-1524 andestablishments1542 as shown inFIG. 15.
• Macrocells such asmacrocell site1502 can have dedicated connections to a mobile network andbase station device1504 or can share and/or otherwise use another connection.Central office1501 can be used to distribute media content and/or provide internet service provider (ISP) services to mobile devices1522-1524 andestablishments1542. Thecentral office1501 can receive media content from a constellation of satellites1530 (one of which is shown inFIG. 15) or other sources of content, and distribute such content to mobile devices1522-1524 andestablishments1542 via the first and second instances of thedistribution system1550 and1560. Thecentral office1501 can also be communicatively coupled to theInternet1503 for providing internet data services to mobile devices1522-1524 andestablishments1542.
• Base station device1504 can be mounted on, or attached to,utility pole1516. In other embodiments,base station device1504 can be near transformers and/or other locations situated nearby a power line.Base station device1504 can facilitate connectivity to a mobile network formobile devices1522 and1524.Antennas1512 and1514, mounted on or nearutility poles1518 and1520, respectively, can receive signals frombase station device1504 and transmit those signals tomobile devices1522 and1524 over a much wider area than if theantennas1512 and1514 were located at or nearbase station device1504.
• It is noted thatFIG. 15 displays three utility poles, in each instance of thedistribution systems1550 and1560, with one base station device, for purposes of simplicity. In other embodiments,utility pole1516 can have more base station devices, and more utility poles with distributed antennas and/or tethered connections toestablishments1542.
• Atransmission device1506, such astransmission device101 or102 presented in conjunction withFIG. 1, can transmit a signal frombase station device1504 toantennas1512 and1514 via utility or power line(s) that connect theutility poles1516,1518, and1520. To transmit the signal, radio source and/ortransmission device1506 upconverts the signal (e.g., via frequency mixing) frombase station device1504 or otherwise converts the signal from thebase station device1504 to a microwave band signal and thetransmission device1506 launches a microwave band wave that propagates as a guided wave traveling along the utility line or other wire as described in previous embodiments. Atutility pole1518, anothertransmission device1508 receives the guided wave (and optionally can amplify it as needed or desired or operate as a repeater to receive it and regenerate it) and sends it forward as a guided wave on the utility line or other wire. Thetransmission device1508 can also extract a signal from the microwave band guided wave and shift it down in frequency or otherwise convert it to its original cellular band frequency (e.g., 1.9 GHz or other defined cellular frequency) or another cellular (or non-cellular) band frequency. Anantenna1512 can wireless transmit the downshifted signal tomobile device1522. The process can be repeated bytransmission device1510,antenna1514 andmobile device1524, as necessary or desirable.
• Transmissions frommobile devices1522 and1524 can also be received byantennas1512 and1514 respectively. Thetransmission devices1508 and1510 can upshift or otherwise convert the cellular band signals to microwave band and transmit the signals as guided wave (e.g., surface wave or other electromagnetic wave) transmissions over the power line(s) tobase station device1504.
• Media content received by thecentral office1501 can be supplied to the second instance of thedistribution system1560 via thebase station device1504 for distribution tomobile devices1522 andestablishments1542. Thetransmission device1510 can be tethered to theestablishments1542 by one or more wired connections or a wireless interface. The one or more wired connections may include without limitation, a power line, a coaxial cable, a fiber cable, a twisted pair cable, a guided wave transmission medium or other suitable wired mediums for distribution of media content and/or for providing internet services. In an example embodiment, the wired connections from thetransmission device1510 can be communicatively coupled to one or more very high bit rate digital subscriber line (VDSL) modems located at one or more corresponding service area interfaces (SAIs—not shown) or pedestals, each SAI or pedestal providing services to a portion of theestablishments1542. The VDSL modems can be used to selectively distribute media content and/or provide internet services to gateways (not shown) located in theestablishments1542. The SAIs or pedestals can also be communicatively coupled to theestablishments1542 over a wired medium such as a power line, a coaxial cable, a fiber cable, a twisted pair cable, a guided wave transmission medium or other suitable wired mediums. In other example embodiments, thetransmission device1510 can be communicatively coupled directly toestablishments1542 without intermediate interfaces such as the SAIs or pedestals.
• In another example embodiment,system1500 can employ diversity paths, where two or more utility lines or other wires are strung between theutility poles1516,1518, and1520 (e.g., for example, two or more wires betweenpoles1516 and1520) and redundant transmissions from base station/macrocell site1502 are transmitted as guided waves down the surface of the utility lines or other wires. The utility lines or other wires can be either insulated or uninsulated, and depending on the environmental conditions that cause transmission losses, the coupling devices can selectively receive signals from the insulated or uninsulated utility lines or other wires. The selection can be based on measurements of the signal-to-noise ratio of the wires, or based on determined weather/environmental conditions (e.g., moisture detectors, weather forecasts, etc.). The use of diversity paths withsystem1500 can enable alternate routing capabilities, load balancing, increased load handling, concurrent bi-directional or synchronous communications, spread spectrum communications, etc.
• It is noted that the use of thetransmission devices1506,1508, and1510 inFIG. 15 are by way of example only, and that in other embodiments, other uses are possible. For instance, transmission devices can be used in a backhaul communication system, providing network connectivity to base station devices.Transmission devices1506,1508, and1510 can be used in many circumstances where it is desirable to transmit guided wave communications over a wire, whether insulated or not insulated.Transmission devices1506,1508, and1510 are improvements over other coupling devices due to no contact or limited physical and/or electrical contact with the wires that may carry high voltages. The transmission device can be located away from the wire (e.g., spaced apart from the wire) and/or located on the wire so long as it is not electrically in contact with the wire, as the dielectric acts as an insulator, allowing for cheap, easy, and/or less complex installation. However, as previously noted conducting or non-dielectric couplers can be employed, for example in configurations where the wires correspond to a telephone network, cable television network, broadband data service, fiber optic communications system or other network employing low voltages or having insulated transmission lines.
• It is further noted, that whilebase station device1504 andmacrocell site1502 are illustrated in an embodiment, other network configurations are likewise possible. For example, devices such as access points or other wireless gateways can be employed in a similar fashion to extend the reach of other networks such as a wireless local area network, a wireless personal area network or other wireless network that operates in accordance with a communication protocol such as a 802.11 protocol, WIMAX protocol, UltraWideband protocol, Bluetooth protocol, Zigbee protocol or other wireless protocol.
• Referring now toFIGS. 16A & 16B, block diagrams illustrating an example, non-limiting embodiment of a system for managing a power grid communication system are shown. ConsideringFIG. 16A, awaveguide system1602 is presented for use in a guided wave communications system, such as the system presented in conjunction withFIG. 15. Thewaveguide system1602 can comprisesensors1604, apower management system1605, atransmission device101 or102 that includes at least onecommunication interface205,transceiver210 andcoupler220.
• Thewaveguide system1602 can be coupled to apower line1610 for facilitating guided wave communications in accordance with embodiments described in the subject disclosure. In an example embodiment, thetransmission device101 or102 includescoupler220 for inducing electromagnetic waves on a surface of thepower line1610 that longitudinally propagate along the surface of thepower line1610 as described in the subject disclosure. Thetransmission device101 or102 can also serve as a repeater for retransmitting electromagnetic waves on thesame power line1610 or for routing electromagnetic waves betweenpower lines1610 as shown inFIGS. 12-13.
• Thetransmission device101 or102 includestransceiver210 configured to, for example, up-convert a signal operating at an original frequency range to electromagnetic waves operating at, exhibiting, or associated with a carrier frequency that propagate along a coupler to induce corresponding guided electromagnetic waves that propagate along a surface of thepower line1610. A carrier frequency can be represented by a center frequency having upper and lower cutoff frequencies that define the bandwidth of the electromagnetic waves. Thepower line1610 can be a wire (e.g., single stranded or multi-stranded) having a conducting surface or insulated surface. Thetransceiver210 can also receive signals from thecoupler220 and down-convert the electromagnetic waves operating at a carrier frequency to signals at their original frequency.
• Signals received by thecommunications interface205 oftransmission device101 or102 for up-conversion can include without limitation signals supplied by acentral office1611 over a wired or wireless interface of thecommunications interface205, abase station1614 over a wired or wireless interface of thecommunications interface205, wireless signals transmitted bymobile devices1620 to thebase station1614 for delivery over the wired or wireless interface of thecommunications interface205, signals supplied by in-building communication devices1618 over the wired or wireless interface of thecommunications interface205, and/or wireless signals supplied to thecommunications interface205 bymobile devices1612 roaming in a wireless communication range of thecommunications interface205. In embodiments where thewaveguide system1602 functions as a repeater, such as shown inFIGS. 12-13, thecommunications interface205 may or may not be included in thewaveguide system1602.
• The electromagnetic waves propagating along the surface of thepower line1610 can be modulated and formatted to include packets or frames of data that include a data payload and further include networking information (such as header information for identifying one or more destination waveguide systems1602). The networking information may be provided by thewaveguide system1602 or an originating device such as thecentral office1611, thebase station1614,mobile devices1620, or in-building devices1618, or a combination thereof. Additionally, the modulated electromagnetic waves can include error correction data for mitigating signal disturbances. The networking information and error correction data can be used by adestination waveguide system1602 for detecting transmissions directed to it, and for down-converting and processing with error correction data transmissions that include voice and/or data signals directed to recipient communication devices communicatively coupled to thedestination waveguide system1602.
• Referring now to thesensors1604 of thewaveguide system1602, thesensors1604 can comprise one or more of a temperature sensor1604a, a disturbance detection sensor1604b, a loss of energy sensor1604c, a noise sensor1604d, a vibration sensor1604e, an environmental (e.g., weather) sensor1604f, and/or an image sensor1604g. The temperature sensor1604acan be used to measure ambient temperature, a temperature of thetransmission device101 or102, a temperature of thepower line1610, temperature differentials (e.g., compared to a setpoint or baseline, betweentransmission device101 or102 and1610, etc.), or any combination thereof. In one embodiment, temperature metrics can be collected and reported periodically to anetwork management system1601 by way of thebase station1614.
• The disturbance detection sensor1604bcan perform measurements on thepower line1610 to detect disturbances such as signal reflections, which may indicate a presence of a downstream disturbance that may impede the propagation of electromagnetic waves on thepower line1610. A signal reflection can represent a distortion resulting from, for example, an electromagnetic wave transmitted on thepower line1610 by thetransmission device101 or102 that reflects in whole or in part back to thetransmission device101 or102 from a disturbance in thepower line1610 located downstream from thetransmission device101 or102.
• Signal reflections can be caused by obstructions on thepower line1610. For example, a tree limb may cause electromagnetic wave reflections when the tree limb is lying on thepower line1610, or is in close proximity to thepower line1610 which may cause a corona discharge. Other obstructions that can cause electromagnetic wave reflections can include without limitation an object that has been entangled on the power line1610 (e.g., clothing, a shoe wrapped around apower line1610 with a shoe string, etc.), a corroded build-up on thepower line1610 or an ice build-up. Power grid components may also impede or obstruct with the propagation of electromagnetic waves on the surface ofpower lines1610. Illustrations of power grid components that may cause signal reflections include without limitation a transformer and a joint for connecting spliced power lines. A sharp angle on thepower line1610 may also cause electromagnetic wave reflections.
• The disturbance detection sensor1604bcan comprise a circuit to compare magnitudes of electromagnetic wave reflections to magnitudes of original electromagnetic waves transmitted by thetransmission device101 or102 to determine how much a downstream disturbance in thepower line1610 attenuates transmissions. The disturbance detection sensor1604bcan further comprise a spectral analyzer circuit for performing spectral analysis on the reflected waves. The spectral data generated by the spectral analyzer circuit can be compared with spectral profiles via pattern recognition, an expert system, curve fitting, matched filtering or other artificial intelligence, classification or comparison technique to identify a type of disturbance based on, for example, the spectral profile that most closely matches the spectral data. The spectral profiles can be stored in a memory of the disturbance detection sensor1604bor may be remotely accessible by the disturbance detection sensor1604b. The profiles can comprise spectral data that models different disturbances that may be encountered onpower lines1610 to enable the disturbance detection sensor1604bto identify disturbances locally. An identification of the disturbance if known can be reported to thenetwork management system1601 by way of thebase station1614. The disturbance detection sensor1604bcan also utilize thetransmission device101 or102 to transmit electromagnetic waves as test signals to determine a roundtrip time for an electromagnetic wave reflection. The round trip time measured by the disturbance detection sensor1604bcan be used to calculate a distance traveled by the electromagnetic wave up to a point where the reflection takes place, which enables the disturbance detection sensor1604bto calculate a distance from thetransmission device101 or102 to the downstream disturbance on thepower line1610.
• The distance calculated can be reported to thenetwork management system1601 by way of thebase station1614. In one embodiment, the location of thewaveguide system1602 on thepower line1610 may be known to thenetwork management system1601, which thenetwork management system1601 can use to determine a location of the disturbance on thepower line1610 based on a known topology of the power grid. In another embodiment, thewaveguide system1602 can provide its location to thenetwork management system1601 to assist in the determination of the location of the disturbance on thepower line1610. The location of thewaveguide system1602 can be obtained by thewaveguide system1602 from a pre-programmed location of thewaveguide system1602 stored in a memory of thewaveguide system1602, or thewaveguide system1602 can determine its location using a GPS receiver (not shown) included in thewaveguide system1602.
• Thepower management system1605 provides energy to the aforementioned components of thewaveguide system1602. Thepower management system1605 can receive energy from solar cells, or from a transformer (not shown) coupled to thepower line1610, or by inductive coupling to thepower line1610 or another nearby power line. Thepower management system1605 can also include a backup battery and/or a super capacitor or other capacitor circuit for providing thewaveguide system1602 with temporary power. The loss of energy sensor1604ccan be used to detect when thewaveguide system1602 has a loss of power condition and/or the occurrence of some other malfunction. For example, the loss of energy sensor1604ccan detect when there is a loss of power due to defective solar cells, an obstruction on the solar cells that causes them to malfunction, loss of power on thepower line1610, and/or when the backup power system malfunctions due to expiration of a backup battery, or a detectable defect in a super capacitor. When a malfunction and/or loss of power occurs, the loss of energy sensor1604ccan notify thenetwork management system1601 by way of thebase station1614.
• The noise sensor1604dcan be used to measure noise on thepower line1610 that may adversely affect transmission of electromagnetic waves on thepower line1610. The noise sensor1604dcan sense unexpected electromagnetic interference, noise bursts, or other sources of disturbances that may interrupt reception of modulated electromagnetic waves on a surface of apower line1610. A noise burst can be caused by, for example, a corona discharge, or other source of noise. The noise sensor1604dcan compare the measured noise to a noise profile obtained by thewaveguide system1602 from an internal database of noise profiles or from a remotely located database that stores noise profiles via pattern recognition, an expert system, curve fitting, matched filtering or other artificial intelligence, classification or comparison technique. From the comparison, the noise sensor1604dmay identify a noise source (e.g., corona discharge or otherwise) based on, for example, the noise profile that provides the closest match to the measured noise. The noise sensor1604dcan also detect how noise affects transmissions by measuring transmission metrics such as bit error rate, packet loss rate, jitter, packet retransmission requests, etc. The noise sensor1604dcan report to thenetwork management system1601 by way of thebase station1614 the identity of noise sources, their time of occurrence, and transmission metrics, among other things.
• The vibration sensor1604ecan include accelerometers and/or gyroscopes to detect2D or3D vibrations on thepower line1610. The vibrations can be compared to vibration profiles that can be stored locally in thewaveguide system1602, or obtained by thewaveguide system1602 from a remote database via pattern recognition, an expert system, curve fitting, matched filtering or other artificial intelligence, classification or comparison technique. Vibration profiles can be used, for example, to distinguish fallen trees from wind gusts based on, for example, the vibration profile that provides the closest match to the measured vibrations. The results of this analysis can be reported by the vibration sensor1604eto thenetwork management system1601 by way of thebase station1614.
• The environmental sensor1604fcan include a barometer for measuring atmospheric pressure, ambient temperature (which can be provided by the temperature sensor1604a), wind speed, humidity, wind direction, and rainfall, among other things. The environmental sensor1604fcan collect raw information and process this information by comparing it to environmental profiles that can be obtained from a memory of thewaveguide system1602 or a remote database to predict weather conditions before they arise via pattern recognition, an expert system, knowledge-based system or other artificial intelligence, classification or other weather modeling and prediction technique. The environmental sensor1604fcan report raw data as well as its analysis to thenetwork management system1601.
• The image sensor1604gcan be a digital camera (e.g., a charged coupled device or CCD imager, infrared camera, etc.) for capturing images in a vicinity of thewaveguide system1602. The image sensor1604gcan include an electromechanical mechanism to control movement (e.g., actual position or focal points/zooms) of the camera for inspecting thepower line1610 from multiple perspectives (e.g., top surface, bottom surface, left surface, right surface and so on). Alternatively, the image sensor1604gcan be designed such that no electromechanical mechanism is needed in order to obtain the multiple perspectives. The collection and retrieval of imaging data generated by the image sensor1604gcan be controlled by thenetwork management system1601, or can be autonomously collected and reported by the image sensor1604gto thenetwork management system1601.
• Other sensors that may be suitable for collecting telemetry information associated with thewaveguide system1602 and/or thepower lines1610 for purposes of detecting, predicting and/or mitigating disturbances that can impede the propagation of electromagnetic wave transmissions on power lines1610 (or any other form of a transmission medium of electromagnetic waves) may be utilized by thewaveguide system1602.
• Referring now toFIG. 16B, block diagram1650 illustrates an example, non-limiting embodiment of a system for managing apower grid1653 and a communication system1655 embedded therein or associated therewith in accordance with various aspects described herein. The communication system1655 comprises a plurality ofwaveguide systems1602 coupled topower lines1610 of thepower grid1653. At least a portion of thewaveguide systems1602 used in the communication system1655 can be in direct communication with abase station1614 and/or thenetwork management system1601.Waveguide systems1602 not directly connected to abase station1614 or thenetwork management system1601 can engage in communication sessions with either abase station1614 or thenetwork management system1601 by way of otherdownstream waveguide systems1602 connected to abase station1614 or thenetwork management system1601.
• Thenetwork management system1601 can be communicatively coupled to equipment of autility company1652 and equipment of acommunications service provider1654 for providing each entity, status information associated with thepower grid1653 and the communication system1655, respectively. Thenetwork management system1601, the equipment of theutility company1652, and thecommunications service provider1654 can access communication devices utilized byutility company personnel1656 and/or communication devices utilized by communicationsservice provider personnel1658 for purposes of providing status information and/or for directing such personnel in the management of thepower grid1653 and/or communication system1655.
• FIG. 17A illustrates a flow diagram of an example, non-limiting embodiment of amethod1700 for detecting and mitigating disturbances occurring in a communication network of the systems ofFIGS. 16A & 16B.Method1700 can begin withstep1702 where awaveguide system1602 transmits and receives messages embedded in, or forming part of, modulated electromagnetic waves or another type of electromagnetic waves traveling along a surface of apower line1610. The messages can be voice messages, streaming video, and/or other data/information exchanged between communication devices communicatively coupled to the communication system1655. Atstep1704 thesensors1604 of thewaveguide system1602 can collect sensing data. In an embodiment, the sensing data can be collected instep1704 prior to, during, or after the transmission and/or receipt of messages instep1702. Atstep1706 the waveguide system1602 (or thesensors1604 themselves) can determine from the sensing data an actual or predicted occurrence of a disturbance in the communication system1655 that can affect communications originating from (e.g., transmitted by) or received by thewaveguide system1602. The waveguide system1602 (or the sensors1604) can process temperature data, signal reflection data, loss of energy data, noise data, vibration data, environmental data, or any combination thereof to make this determination. The waveguide system1602 (or the sensors1604) may also detect, identify, estimate, or predict the source of the disturbance and/or its location in the communication system1655. If a disturbance is neither detected/identified nor predicted/estimated atstep1708, thewaveguide system1602 can proceed to step1702 where it continues to transmit and receive messages embedded in, or forming part of, modulated electromagnetic waves traveling along a surface of thepower line1610.
• If at step1708 a disturbance is detected/identified or predicted/estimated to occur, thewaveguide system1602 proceeds to step1710 to determine if the disturbance adversely affects (or alternatively, is likely to adversely affect or the extent to which it may adversely affect) transmission or reception of messages in the communication system1655. In one embodiment, a duration threshold and a frequency of occurrence threshold can be used atstep1710 to determine when a disturbance adversely affects communications in the communication system1655. For illustration purposes only, assume a duration threshold is set to 500 ms, while a frequency of occurrence threshold is set to 5 disturbances occurring in an observation period of 10 sec. Thus, a disturbance having a duration greater than 500 ms will trigger the duration threshold. Additionally, any disturbance occurring more than 5 times in a 10 sec time interval will trigger the frequency of occurrence threshold.
• In one embodiment, a disturbance may be considered to adversely affect signal integrity in the communication systems1655 when the duration threshold alone is exceeded. In another embodiment, a disturbance may be considered as adversely affecting signal integrity in the communication systems1655 when both the duration threshold and the frequency of occurrence threshold are exceeded. The latter embodiment is thus more conservative than the former embodiment for classifying disturbances that adversely affect signal integrity in the communication system1655. It will be appreciated that many other algorithms and associated parameters and thresholds can be utilized forstep1710 in accordance with example embodiments.
• Referring back tomethod1700, if atstep1710 the disturbance detected atstep1708 does not meet the condition for adversely affected communications (e.g., neither exceeds the duration threshold nor the frequency of occurrence threshold), thewaveguide system1602 may proceed to step1702 and continue processing messages. For instance, if the disturbance detected instep1708 has a duration of 1 msec with a single occurrence in a 10 sec time period, then neither threshold will be exceeded. Consequently, such a disturbance may be considered as having a nominal effect on signal integrity in the communication system1655 and thus would not be flagged as a disturbance requiring mitigation. Although not flagged, the occurrence of the disturbance, its time of occurrence, its frequency of occurrence, spectral data, and/or other useful information, may be reported to thenetwork management system1601 as telemetry data for monitoring purposes.
• Referring back tostep1710, if on the other hand the disturbance satisfies the condition for adversely affected communications (e.g., exceeds either or both thresholds), thewaveguide system1602 can proceed to step1712 and report the incident to thenetwork management system1601. The report can include raw sensing data collected by thesensors1604, a description of the disturbance if known by thewaveguide system1602, a time of occurrence of the disturbance, a frequency of occurrence of the disturbance, a location associated with the disturbance, parameters readings such as bit error rate, packet loss rate, retransmission requests, jitter, latency and so on. If the disturbance is based on a prediction by one or more sensors of thewaveguide system1602, the report can include a type of disturbance expected, and if predictable, an expected time occurrence of the disturbance, and an expected frequency of occurrence of the predicted disturbance when the prediction is based on historical sensing data collected by thesensors1604 of thewaveguide system1602.
• Atstep1714, thenetwork management system1601 can determine a mitigation, circumvention, or correction technique, which may include directing thewaveguide system1602 to reroute traffic to circumvent the disturbance if the location of the disturbance can be determined. In one embodiment, thewaveguide coupling device1402 detecting the disturbance may direct a repeater such as the one shown inFIGS. 13-14 to connect thewaveguide system1602 from a primary power line affected by the disturbance to a secondary power line to enable thewaveguide system1602 to reroute traffic to a different transmission medium and avoid the disturbance. In an embodiment where thewaveguide system1602 is configured as a repeater thewaveguide system1602 can itself perform the rerouting of traffic from the primary power line to the secondary power line. It is further noted that for bidirectional communications (e.g., full or half-duplex communications), the repeater can be configured to reroute traffic from the secondary power line back to the primary power line for processing by thewaveguide system1602.
• In another embodiment, thewaveguide system1602 can redirect traffic by instructing a first repeater situated upstream of the disturbance and a second repeater situated downstream of the disturbance to redirect traffic from a primary power line temporarily to a secondary power line and back to the primary power line in a manner that avoids the disturbance. It is further noted that for bidirectional communications (e.g., full or half-duplex communications), repeaters can be configured to reroute traffic from the secondary power line back to the primary power line.
• To avoid interrupting existing communication sessions occurring on a secondary power line, thenetwork management system1601 may direct thewaveguide system1602 to instruct repeater(s) to utilize unused time slot(s) and/or frequency band(s) of the secondary power line for redirecting data and/or voice traffic away from the primary power line to circumvent the disturbance.
• Atstep1716, while traffic is being rerouted to avoid the disturbance, thenetwork management system1601 can notify equipment of theutility company1652 and/or equipment of thecommunications service provider1654, which in turn may notify personnel of theutility company1656 and/or personnel of thecommunications service provider1658 of the detected disturbance and its location if known. Field personnel from either party can attend to resolving the disturbance at a determined location of the disturbance. Once the disturbance is removed or otherwise mitigated by personnel of the utility company and/or personnel of the communications service provider, such personnel can notify their respective companies and/or thenetwork management system1601 utilizing field equipment (e.g., a laptop computer, smartphone, etc.) communicatively coupled tonetwork management system1601, and/or equipment of the utility company and/or the communications service provider. The notification can include a description of how the disturbance was mitigated and any changes to thepower lines1610 that may change a topology of the communication system1655.
• Once the disturbance has been resolved (as determined in decision1718), thenetwork management system1601 can direct thewaveguide system1602 atstep1720 to restore the previous routing configuration used by thewaveguide system1602 or route traffic according to a new routing configuration if the restoration strategy used to mitigate the disturbance resulted in a new network topology of the communication system1655. In another embodiment, thewaveguide system1602 can be configured to monitor mitigation of the disturbance by transmitting test signals on thepower line1610 to determine when the disturbance has been removed. Once thewaveguide system1602 detects an absence of the disturbance it can autonomously restore its routing configuration without assistance by thenetwork management system1601 if it determines the network topology of the communication system1655 has not changed, or it can utilize a new routing configuration that adapts to a detected new network topology.
• FIG. 17B illustrates a flow diagram of an example, non-limiting embodiment of amethod1750 for detecting and mitigating disturbances occurring in a communication network of the system ofFIGS. 16A and 16B. In one embodiment,method1750 can begin withstep1752 where anetwork management system1601 receives from equipment of theutility company1652 or equipment of thecommunications service provider1654 maintenance information associated with a maintenance schedule. Thenetwork management system1601 can atstep1754 identify from the maintenance information, maintenance activities to be performed during the maintenance schedule. From these activities, thenetwork management system1601 can detect a disturbance resulting from the maintenance (e.g., scheduled replacement of apower line1610, scheduled replacement of awaveguide system1602 on thepower line1610, scheduled reconfiguration ofpower lines1610 in thepower grid1653, etc.).
• In another embodiment, thenetwork management system1601 can receive atstep1755 telemetry information from one ormore waveguide systems1602. The telemetry information can include among other things an identity of eachwaveguide system1602 submitting the telemetry information, measurements taken bysensors1604 of eachwaveguide system1602, information relating to predicted, estimated, or actual disturbances detected by thesensors1604 of eachwaveguide system1602, location information associated with eachwaveguide system1602, an estimated location of a detected disturbance, an identification of the disturbance, and so on. Thenetwork management system1601 can determine from the telemetry information a type of disturbance that may be adverse to operations of the waveguide, transmission of the electromagnetic waves along the wire surface, or both. Thenetwork management system1601 can also use telemetry information frommultiple waveguide systems1602 to isolate and identify the disturbance. Additionally, thenetwork management system1601 can request telemetry information fromwaveguide systems1602 in a vicinity of anaffected waveguide system1602 to triangulate a location of the disturbance and/or validate an identification of the disturbance by receiving similar telemetry information fromother waveguide systems1602.
• In yet another embodiment, thenetwork management system1601 can receive atstep1756 an unscheduled activity report from maintenance field personnel. Unscheduled maintenance may occur as result of field calls that are unplanned or as a result of unexpected field issues discovered during field calls or scheduled maintenance activities. The activity report can identify changes to a topology configuration of thepower grid1653 resulting from field personnel addressing discovered issues in the communication system1655 and/orpower grid1653, changes to one or more waveguide systems1602 (such as replacement or repair thereof), mitigation of disturbances performed if any, and so on.
• Atstep1758, thenetwork management system1601 can determine from reports received according tosteps1752 through1756 if a disturbance will occur based on a maintenance schedule, or if a disturbance has occurred or is predicted to occur based on telemetry data, or if a disturbance has occurred due to an unplanned maintenance identified in a field activity report. From any of these reports, thenetwork management system1601 can determine whether a detected or predicted disturbance requires rerouting of traffic by the affectedwaveguide systems1602 orother waveguide systems1602 of the communication system1655.
• When a disturbance is detected or predicted atstep1758, thenetwork management system1601 can proceed to step1760 where it can direct one ormore waveguide systems1602 to reroute traffic to circumvent the disturbance. When the disturbance is permanent due to a permanent topology change of thepower grid1653, thenetwork management system1601 can proceed to step1770 and skipsteps1762,1764,1766, and1772. Atstep1770, thenetwork management system1601 can direct one ormore waveguide systems1602 to use a new routing configuration that adapts to the new topology. However, when the disturbance has been detected from telemetry information supplied by one ormore waveguide systems1602, thenetwork management system1601 can notify maintenance personnel of theutility company1656 or thecommunications service provider1658 of a location of the disturbance, a type of disturbance if known, and related information that may be helpful to such personnel to mitigate the disturbance. When a disturbance is expected due to maintenance activities, thenetwork management system1601 can direct one ormore waveguide systems1602 to reconfigure traffic routes at a given schedule (consistent with the maintenance schedule) to avoid disturbances caused by the maintenance activities during the maintenance schedule.
• Returning back tostep1760 and upon its completion, the process can continue with step1762. At step1762, thenetwork management system1601 can monitor when the disturbance(s) have been mitigated by field personnel. Mitigation of a disturbance can be detected at step1762 by analyzing field reports submitted to thenetwork management system1601 by field personnel over a communications network (e.g., cellular communication system) utilizing field equipment (e.g., a laptop computer or handheld computer/device). If field personnel have reported that a disturbance has been mitigated, thenetwork management system1601 can proceed to step1764 to determine from the field report whether a topology change was required to mitigate the disturbance. A topology change can include rerouting apower line1610, reconfiguring awaveguide system1602 to utilize adifferent power line1610, otherwise utilizing an alternative link to bypass the disturbance and so on. If a topology change has taken place, thenetwork management system1601 can direct atstep1770 one ormore waveguide systems1602 to use a new routing configuration that adapts to the new topology.
• If, however, a topology change has not been reported by field personnel, thenetwork management system1601 can proceed to step1766 where it can direct one ormore waveguide systems1602 to send test signals to test a routing configuration that had been used prior to the detected disturbance(s). Test signals can be sent to affectedwaveguide systems1602 in a vicinity of the disturbance. The test signals can be used to determine if signal disturbances (e.g., electromagnetic wave reflections) are detected by any of thewaveguide systems1602. If the test signals confirm that a prior routing configuration is no longer subject to previously detected disturbance(s), then thenetwork management system1601 can atstep1772 direct theaffected waveguide systems1602 to restore a previous routing configuration. If, however, test signals analyzed by one or morewaveguide coupling device1402 and reported to thenetwork management system1601 indicate that the disturbance(s) or new disturbance(s) are present, then thenetwork management system1601 will proceed to step1768 and report this information to field personnel to further address field issues. Thenetwork management system1601 can in this situation continue to monitor mitigation of the disturbance(s) at step1762.
• In the aforementioned embodiments, thewaveguide systems1602 can be configured to be self-adapting to changes in thepower grid1653 and/or to mitigation of disturbances. That is, one or moreaffected waveguide systems1602 can be configured to self-monitor mitigation of disturbances and reconfigure traffic routes without requiring instructions to be sent to them by thenetwork management system1601. In this embodiment, the one ormore waveguide systems1602 that are self-configurable can inform thenetwork management system1601 of its routing choices so that thenetwork management system1601 can maintain a macro-level view of the communication topology of the communication system1655.
• While for purposes of simplicity of explanation, the respective processes are shown and described as a series of blocks inFIGS. 17A and 17B, respectively, it is to be understood and appreciated that the claimed subject matter is not limited by the order of the blocks, as some blocks may occur in different orders and/or concurrently with other blocks from what is depicted and described herein. Moreover, not all illustrated blocks may be required to implement the methods described herein.
• Turning now toFIG. 18A, a block diagram illustrating an example, non-limiting embodiment of atransmission medium1800 for propagating guided electromagnetic waves is shown. In particular, a further example oftransmission medium125 presented in conjunction withFIG. 1 is presented. In an embodiment, thetransmission medium1800 can comprise afirst dielectric material1802 and asecond dielectric material1804 disposed thereon. In an embodiment, thefirst dielectric material1802 can comprise a dielectric core (referred to herein as dielectric core1802) and thesecond dielectric material1804 can comprise a cladding or shell such as a dielectric foam that surrounds in whole or in part the dielectric core (referred to herein as dielectric foam1804). In an embodiment, thedielectric core1802 anddielectric foam1804 can be coaxially aligned to each other (although not necessary). In an embodiment, the combination of thedielectric core1802 and thedielectric foam1804 can be flexed or bent at least by 45 degrees without damaging the materials of thedielectric core1802 and thedielectric foam1804. In an embodiment, an outer surface of thedielectric foam1804 can be further surrounded in whole or in part by a thirddielectric material1806, which can serve as an outer jacket (referred to herein as jacket1806). Thejacket1806 can prevent exposure of thedielectric core1802 and thedielectric foam1804 to an environment that can adversely affect the propagation of electromagnetic waves (e.g., water, soil, etc.).
• Thedielectric core1802 can comprise, for example, a high density polyethylene material, a high density polyurethane material, or other suitable dielectric material(s). Thedielectric foam1804 can comprise, for example, a cellular plastic material such an expanded polyethylene material, or other suitable dielectric material(s). Thejacket1806 can comprise, for example, a polyethylene material or equivalent. In an embodiment, the dielectric constant of thedielectric foam1804 can be (or substantially) lower than the dielectric constant of thedielectric core1802. For example, the dielectric constant of thedielectric core1802 can be approximately 2.3 while the dielectric constant of thedielectric foam1804 can be approximately 1.15 (slightly higher than the dielectric constant of air).
• Thedielectric core1802 can be used for receiving signals in the form of electromagnetic waves from a launcher or other coupling device described herein which can be configured to launch guided electromagnetic waves on thetransmission medium1800. In one embodiment, thetransmission1800 can be coupled to ahollow waveguide1808 structured as, for example, acircular waveguide1809, which can receive electromagnetic waves from a radiating device such as a stub antenna (not shown). Thehollow waveguide1808 can in turn induce guided electromagnetic waves in thedielectric core1802. In this configuration, the guided electromagnetic waves are guided by or bound to thedielectric core1802 and propagate longitudinally along thedielectric core1802. By adjusting electronics of the launcher, an operating frequency of the electromagnetic waves can be chosen such that afield intensity profile1810 of the guided electromagnetic waves extends nominally (or not at all) outside of thejacket1806.
• By maintaining most (if not all) of the field strength of the guided electromagnetic waves within portions of thedielectric core1802, thedielectric foam1804 and/or thejacket1806, thetransmission medium1800 can be used in hostile environments without adversely affecting the propagation of the electromagnetic waves propagating therein. For example, thetransmission medium1800 can be buried in soil with no (or nearly no) adverse effect to the guided electromagnetic waves propagating in thetransmission medium1800. Similarly, thetransmission medium1800 can be exposed to water (e.g., rain or placed underwater) with no (or nearly no) adverse effect to the guided electromagnetic waves propagating in thetransmission medium1800. In an embodiment, the propagation loss of guided electromagnetic waves in the foregoing embodiments can be 1 to 2 dB per meter or better at an operating frequency of 60 GHz. Depending on the operating frequency of the guided electromagnetic waves and/or the materials used for thetransmission medium1800 other propagation losses may be possible. Additionally, depending on the materials used to construct thetransmission medium1800, thetransmission medium1800 can in some embodiments be flexed laterally with no (or nearly no) adverse effect to the guided electromagnetic waves propagating through thedielectric core1802 and thedielectric foam1804.
• FIG. 18B depicts atransmission medium1820 that differs from thetransmission medium1800 ofFIG. 18A, yet provides a further example of thetransmission medium125 presented in conjunction withFIG. 1. Thetransmission medium1820 shows similar reference numerals for similar elements of thetransmission medium1800 ofFIG. 18A. In contrast to thetransmission medium1800, thetransmission medium1820 comprises aconductive core1822 having aninsulation layer1823 surrounding theconductive core1822 in whole or in part. The combination of theinsulation layer1823 and theconductive core1822 will be referred to herein as aninsulated conductor1825. In the illustration ofFIG. 18B, theinsulation layer1823 is covered in whole or in part by adielectric foam1804 andjacket1806, which can be constructed from the materials previously described. In an embodiment, theinsulation layer1823 can comprise a dielectric material, such as polyethylene, having a higher dielectric constant than the dielectric foam1804 (e.g., 2.3 and 1.15, respectively). In an embodiment, the components of thetransmission medium1820 can be coaxially aligned (although not necessary). In an embodiment, ahollow waveguide1808 havingmetal plates1809, which can be separated from the insulation layer1823 (although not necessary) can be used to launch guided electromagnetic waves that substantially propagate on an outer surface of theinsulation layer1823, however other coupling devices as described herein can likewise be employed. In an embodiment, the guided electromagnetic waves can be sufficiently guided by or bound by theinsulation layer1823 to guide the electromagnetic waves longitudinally along theinsulation layer1823. By adjusting operational parameters of the launcher, an operating frequency of the guided electromagnetic waves launched by thehollow waveguide1808 can generate an electricfield intensity profile1824 that results in the guided electromagnetic waves being substantially confined within thedielectric foam1804 thereby preventing the guided electromagnetic waves from being exposed to an environment (e.g., water, soil, etc.) that adversely affects propagation of the guided electromagnetic waves via thetransmission medium1820.
• FIG. 18C depicts atransmission medium1830 that differs from thetransmission mediums1800 and1820 ofFIGS. 18A and 18B, yet provides a further example of thetransmission medium125 presented in conjunction withFIG. 1. Thetransmission medium1830 shows similar reference numerals for similar elements of thetransmission mediums1800 and1820 ofFIGS. 18A and 18B, respectively. In contrast to thetransmission mediums1800 and1820, thetransmission medium1830 comprises a bare (or uninsulated)conductor1832 surrounded in whole or in part by thedielectric foam1804 and thejacket1806, which can be constructed from the materials previously described. In an embodiment, the components of thetransmission medium1830 can be coaxially aligned (although not necessary). In an embodiment, ahollow waveguide1808 havingmetal plates1809 coupled to thebare conductor1832 can be used to launch guided electromagnetic waves that substantially propagate on an outer surface of thebare conductor1832, however other coupling devices described herein can likewise be employed. In an embodiment, the guided electromagnetic waves can be sufficiently guided by or bound by thebare conductor1832 to guide the guided electromagnetic waves longitudinally along thebare conductor1832. By adjusting operational parameters of the launcher, an operating frequency of the guided electromagnetic waves launched by thehollow waveguide1808 can generate an electricfield intensity profile1834 that results in the guided electromagnetic waves being substantially confined within thedielectric foam1804 thereby preventing the guided electromagnetic waves from being exposed to an environment (e.g., water, soil, etc.) that adversely affects propagation of the electromagnetic waves via thetransmission medium1830.
• It should be noted that thehollow launcher1808 used with thetransmission mediums1800,1820 and1830 ofFIGS. 18A, 18B and 18C, respectively, can be replaced with other launchers or coupling devices. Additionally, the propagation mode(s) of the electromagnetic waves for any of the foregoing embodiments can be fundamental mode(s), a non-fundamental (or asymmetric) mode(s), or combinations thereof.
• FIG. 18D is a block diagram illustrating an example, non-limiting embodiment of bundledtransmission media1836 in accordance with various aspects described herein. The bundledtransmission media1836 can comprise a plurality ofcables1838 held in place by aflexible sleeve1839. The plurality ofcables1838 can comprise multiple instances ofcable1800 ofFIG. 18A, multiple instances ofcable1820 ofFIG. 18B, multiple instances ofcable1830 ofFIG. 18C, or any combinations thereof. Thesleeve1839 can comprise a dielectric material that prevents soil, water or other external materials from making contact with the plurality ofcables1838. In an embodiment, a plurality of launchers, each utilizing a transceiver similar to the one depicted inFIG. 10A or other coupling devices described herein, can be adapted to selectively induce a guided electromagnetic wave in each cable, each guided electromagnetic wave conveys different data (e.g., voice, video, messaging, content, etc.). In an embodiment, by adjusting operational parameters of each launcher or other coupling device, the electric field intensity profile of each guided electromagnetic wave can be fully or substantially confined within layers of acorresponding cable1838 to reduce cross-talk betweencables1838.
• In situations where the electric field intensity profile of each guided electromagnetic wave is not fully or substantially confined within acorresponding cable1838, cross-talk of electromagnetic signals can occur betweencables1838 as illustrated by signal plots associated with two cables depicted inFIG. 18E. The plots inFIG. 18E show that when a guided electromagnetic wave is induced on a first cable, the emitted electric and magnetic fields of the first cable can induce signals on the second cable, which results in cross-talk. Several mitigation options can be used to reduce cross-talk between thecables1838 ofFIG. 18D. In an embodiment, anabsorption material1840 that can absorb electromagnetic fields, such as carbon, can be applied to thecables1838 as shown inFIG. 18F to polarize each guided electromagnetic wave at various polarization states to reduce cross-talk betweencables1838. In another embodiment (not shown), carbon beads can be added to gaps between thecables1838 to reduce cross-talk.
• In yet another embodiment (not shown), a diameter ofcable1838 can be configured differently to vary a speed of propagation of guided electromagnetic waves between thecables1838 in order to reduce cross-talk betweencables1838. In an embodiment (not shown), a shape of eachcable1838 can be made asymmetric (e.g., elliptical) to direct the guided electromagnetic fields of eachcable1838 away from each other to reduce cross-talk. In an embodiment (not shown), a filler material such as dielectric foam can be added betweencables1838 to sufficiently separate thecables1838 to reduce cross-talk therebetween. In an embodiment (not shown), longitudinal carbon strips or swirls can be applied to on an outer surface of thejacket1806 of eachcable1838 to reduce radiation of guided electromagnetic waves outside of thejacket1806 and thereby reduce cross-talk betweencables1838. In yet another embodiment, each launcher can be configured to launch a guided electromagnetic wave having a different frequency, modulation, wave propagation mode, such as an orthogonal frequency, modulation or mode, to reduce cross-talk between thecables1838.
• In yet another embodiment (not shown), pairs ofcables1838 can be twisted in a helix to reduce cross-talk between the pairs andother cables1838 in a vicinity of the pairs. In some embodiments,certain cables1838 can be twisted whileother cables1838 are not twisted to reduce cross-talk between thecables1838. Additionally, eachtwisted pair cable1838 can have different pitches (i.e., different twist rates, such as twists per meter) to further reduce cross-talk between the pairs andother cables1838 in a vicinity of the pairs. In another embodiment (not shown), launchers or other coupling devices can be configured to induce guided electromagnetic waves in thecables1838 having electromagnetic fields that extend beyond thejacket1806 into gaps between the cables to reduce cross-talk between thecables1838. It is submitted that any one of the foregoing embodiments for mitigating cross-talk betweencables1838 can be combined to further reduce cross-talk therebetween.
• FIGS. 18G and 18H are block diagrams illustrating example, non-limiting embodiments of a transmission medium with an inner waveguide in accordance with various aspects described herein. In an embodiment, atransmission medium1841 can comprise acore1842. In one embodiment, thecore1842 can be a dielectric core1842 (e.g., polyethylene). In another embodiment, thecore1842 can be an insulated or uninsulated conductor. Thecore1842 can be surrounded by a shell1844 comprising a dielectric foam (e.g., expanded polyethylene material) having a lower dielectric constant than the dielectric constant of a dielectric core, or insulation layer of a conductive core. The difference in dielectric constants enables electromagnetic waves to be bound and guided by thecore1842. The shell1844 can be covered by ashell jacket1845. Theshell jacket1845 can be made of rigid material (e.g., high density plastic) or a high tensile strength material (e.g., synthetic fiber). In an embodiment, theshell jacket1845 can be used to prevent exposure of the shell1844 and core1842 from an adverse environment (e.g., water, moisture, soil, etc.). In an embodiment, theshell jacket1845 can be sufficiently rigid to separate an outer surface of the core1842 from an inner surface of theshell jacket1845 thereby resulting in a longitudinal gap between the shell jacket1854 and thecore1842. The longitudinal gap can be filled with the dielectric foam of the shell1844.
• Thetransmission medium1841 can further include a plurality ofouter ring conductors1846. Theouter ring conductors1846 can be strands of conductive material that are woven around theshell jacket1845, thereby covering theshell jacket1845 in whole or in part. Theouter ring conductors1846 can serve the function of a power line having a return electrical path similar to the embodiments described in the subject disclosure for receiving power signals from a source (e.g., a transformer, a power generator, etc.). In one embodiment, theouter ring conductors1846 can be covered by acable jacket1847 to prevent exposure of theouter ring conductors1846 to water, soil, or other environmental factors. Thecable jacket1847 can be made of an insulating material such as polyethylene. Thecore1842 can be used as a center waveguide for the propagation of electromagnetic waves. Ahallow waveguide launcher1808, such as the circular waveguide previously described, can be used to launch signals that induce electromagnetic waves guided by thecore1842 in ways similar to those described for the embodiments ofFIGS. 18A, 18B, and 18C. The electromagnetic waves can be guided by thecore1842 without utilizing the electrical return path of theouter ring conductors1846 or any other electrical return path. By adjusting electronics of thelauncher1808, an operating frequency of the electromagnetic waves can be chosen such that a field intensity profile of the guided electromagnetic waves extends nominally (or not at all) outside of theshell jacket1845.
• In another embodiment, atransmission medium1843 can comprise ahollow core1842′ surrounded by ashell jacket1845′. Theshell jacket1845′ can have an inner conductive surface or other surface materials that enable thehollow core1842′ to be used as a conduit for electromagnetic waves. Theshell jacket1845′ can be covered at least in part with theouter ring conductors1846 described earlier for conducting a power signal. In an embodiment, acable jacket1847 can be disposed on an outer surface of theouter ring conductors1846 to prevent exposure of theouter ring conductors1846 to water, soil or other environmental factors. Awaveguide launcher1808 can be used to launch electromagnetic waves guided by thehollow core1842′ and the conductive inner surface of theshell jacket1845′. In an embodiment (not shown) thehollow core1842′ can further include a dielectric foam such as described earlier.
• Transmission medium1841 can represent a multi-purpose cable that conducts power on theouter ring conductors1846 utilizing an electrical return path and that provides communication services by way of an inner waveguide comprising a combination of thecore1842, the shell1844 and theshell jacket1845. The inner waveguide can be used for transmitting or receiving electromagnetic waves (without utilizing an electrical return path) guided by thecore1842. Similarly,transmission medium1843 can represent a multi-purpose cable that conducts power on theouter ring conductors1846 utilizing an electrical return path and that provides communication services by way of an inner waveguide comprising a combination of thehollow core1842′ and theshell jacket1845′. The inner waveguide can be used for transmitting or receiving electromagnetic waves (without utilizing an electrical return path) guided thehollow core1842′ and theshell jacket1845′.
• It is submitted that embodiments ofFIGS. 18G-18H can be adapted to use multiple inner waveguides surrounded byouter ring conductors1846. The inner waveguides can be adapted to use to cross-talk mitigation techniques described above (e.g., twisted pairs of waveguides, waveguides of different structural dimensions, use of polarizers within the shell, use of different wave modes, etc.).
• For illustration purposes only, thetransmission mediums1800,1820,18301836,1841 and1843 will be referred to herein as acable1850 with an understanding thatcable1850 can represent any one of the transmission mediums described in the subject disclosure, or a bundling of multiple instances thereof. For illustration purposes only, thedielectric core1802, insulatedconductor1825,bare conductor1832,core1842, orhollow core1842′ of thetransmission mediums1800,1820,1830,1836,1841 and1843, respectively, will be referred to herein astransmission core1852 with an understanding thatcable1850 can utilize thedielectric core1802, insulatedconductor1825,bare conductor1832,core1842, orhollow core1842′ oftransmission mediums1800,1820,1830,1836,1841 and/or1843, respectively.
• Turning now toFIGS. 18I and 18J, block diagrams illustrating example, non-limiting embodiments of connector configurations that can be used bycable1850 are shown. In one embodiment,cable1850 can be configured with a female connection arrangement or a male connection arrangement as depicted inFIG. 18I. The male configuration on the right ofFIG. 18I can be accomplished by stripping the dielectric foam1804 (andjacket1806 if there is one) to expose a portion of thetransmission core1852. The female configuration on the left ofFIG. 18I can be accomplished by removing a portion of thetransmission core1852, while maintaining the dielectric foam1804 (andjacket1806 if there is one). In an embodiment in which thetransmission core1852 is hollow as described in relation toFIG. 18H, the male portion of thetransmission core1852 can represent a hollow core with a rigid outer surface that can slide into the female arrangement on the left side ofFIG. 18I to align the hollow cores together. It is further noted that in the embodiments ofFIGS. 18G-18H, the outer ring ofconductors1846 can be modified to connect male and female portions ofcable1850.
• Based on the aforementioned embodiments, the twocables1850 having male and female connector arrangements can be mated together. A sleeve with an adhesive inner lining or a shrink wrap material (not shown) can be applied to an area of a joint betweencables1850 to maintain the joint in a fixed position and prevent exposure (e.g., to water, soil, etc.). When thecables1850 are mated, thetransmission core1852 of one cable will be in close proximity to thetransmission core1852 of the other cable. Guided electromagnetic waves propagating by way of either thetransmission core1852 ofcables1850 traveling from either direction can cross over between the disjoint thetransmission cores1852 whether or not thetransmission cores1852 touch, whether or not thetransmission cores1852 are coaxially aligned, and/or whether or not there is a gap between thetransmission cores1852.
• In another embodiment, asplicing device1860 having female connector arrangements at both ends can be used to matecables1850 having male connector arrangements as shown inFIG. 18J. In an alternative embodiment not shown inFIG. 18J, thesplicing device1860 can be adapted to have male connector arrangements at both ends which can be mated tocables1850 having female connector arrangements. In another embodiment not shown inFIG. 18J, thesplicing device1860 can be adapted to have a male connector arrangement and a female connector arrangement at opposite ends which can be mated tocables1850 having female and male connector arrangements, respectively. It is further noted that for atransmission core1852 having a hollow core, the male and female arrangements described inFIG. 18I can be applied to thesplicing device1860 whether the ends of thesplicing device1860 are both male, both female, or a combination thereof.
• The foregoing embodiments for connecting cables illustrated inFIGS. 18I-18J can be applied to each single instance ofcable1838 of bundledtransmission media1836. Similarly, the foregoing embodiments illustrated inFIGS. 18I-18J can be applied to each single instance of an inner waveguide for acable1841 or1843 having multiple inner waveguides.
• Turning now toFIG. 18K, a block diagram illustrating example, non-limiting embodiments oftransmission mediums1800′,1800″,1800′″ and1800″″ for propagating guided electromagnetic waves is shown. In an embodiment, atransmission medium1800′ can include acore1801, and adielectric foam1804′ divided into sections and covered by ajacket1806 as shown inFIG. 18K. Thecore1801 can be represented by thedielectric core1802 ofFIG. 18A, theinsulated conductor1825 ofFIG. 18B, or thebare conductor1832 ofFIG. 18C. Each section ofdielectric foam1804′ can be separated by a gap (e.g., air, gas, vacuum, or a substance with a low dielectric constant). In an embodiment, the gap separations between the sections ofdielectric foam1804′ can be quasi-random as shown inFIG. 18K, which can be helpful in reducing reflections of electromagnetic waves occurring at each section ofdielectric foam1804′ as they propagate longitudinally along thecore1801. The sections of thedielectric foam1804′ can be constructed, for example, as washers made of a dielectric foam having an inner opening for supporting thecore1801 in a fixed position. For illustration purposes only, the washers will be referred to herein aswashers1804′. In an embodiment, the inner opening of eachwasher1804′ can be coaxially aligned with an axis of thecore1801. In another embodiment, the inner opening of eachwasher1804′ can be offset from the axis of thecore1801. In another embodiment (not shown), eachwasher1804′ can have a variable longitudinal thickness as shown by differences in thickness of thewashers1804′.
• In an alternative embodiment, atransmission medium1800″ can include acore1801, and a strip ofdielectric foam1804″ wrapped around the core in a helix covered by ajacket1806 as shown inFIG. 18K. Although it may not be apparent from the drawing shown inFIG. 18K, in an embodiment the strip ofdielectric foam1804″ can be twisted around thecore1801 with variable pitches (i.e., different twist rates) for different sections of the strip ofdielectric foam1804″. Utilizing variable pitches can help reduce reflections or other disturbances of the electromagnetic waves occurring between areas of thecore1801 not covered by the strip ofdielectric foam1804″. It is further noted that the thickness (diameter) of the strip ofdielectric foam1804″ can be substantially larger (e.g., 2 or more times larger) than diameter of thecore1801 shown inFIG. 18K.
• In an alternative embodiment, atransmission medium1800′″ (shown in a cross-sectional view) can include anon-circular core1801′ covered by adielectric foam1804 andjacket1806. In an embodiment, thenon-circular core1801′ can have an elliptical structure as shown inFIG. 18K, or other suitable non-circular structure. In another embodiment, thenon-circular core1801′ can have an asymmetric structure. Anon-circular core1801′ can be used to polarize the fields of electromagnetic waves induced on thenon-circular core1801′. The structure of thenon-circular core1801′ can help preserve the polarization of the electromagnetic waves as they propagate along thenon-circular core1801′.
• In an alternative embodiment, atransmission medium1800″″ (shown in a cross-sectional view) can includemultiple cores1801″ (only two cores are shown but more are possible). Themultiple cores1801″ can be covered by adielectric foam1804 andjacket1806. Themultiple cores1801″ can be used to polarize the fields of electromagnetic waves induced on themultiple cores1801″. The structure of themultiple cores1801′ can preserve the polarization of the guided electromagnetic waves as they propagate along themultiple cores1801″.
• It will be appreciated that the embodiments ofFIG. 18K can be used to modify the embodiments ofFIGS. 18G-18H. For example,core1842 orcore1842′ can be adapted to utilizedsectionalized shells1804′ with gaps therebetween, or one or more strips ofdielectric foam1804″. Similarly,core1842 orcore1842′ can be adapted to have anon-circular core1801′ that may have symmetric or asymmetric cross-sectional structure. Additionally,core1842 orcore1842′ can be adapted to usemultiple cores1801″ in a single inner waveguide, or different numbers of cores when multiple inner waveguides are used. Accordingly, any of the embodiments shown inFIG. 18K can be applied singly or in combination to the embodiments of18G-18H.
• Turning now toFIG. 18L is a block diagram illustrating example, non-limiting embodiments of bundled transmission media to mitigate cross-talk in accordance with various aspects described herein. In an embodiment, a bundledtransmission medium1836′ can includevariable core structures1803. By varying the structures ofcores1803, fields of guided electromagnetic waves induced in each of the cores oftransmission medium1836′ may differ sufficiently to reduce cross-talk betweencables1838. In another embodiment, a bundledtransmission media1836″ can include a variable number ofcores1803′ percable1838. By varying the number ofcores1803′ percable1838, fields of guided electromagnetic waves induced in the one or more cores oftransmission medium1836″ may differ sufficiently to reduce cross-talk betweencables1838. In another embodiment, thecores1803 or1803′ can be of different materials. For example, thecores1803 or1803′ can be adielectric core1802, aninsulated conductor core1825, abare conductor core1832, or any combinations thereof.
• It is noted that the embodiments illustrated inFIGS. 18A-18D and 18F-18H can be modified by and/or combined with some of the embodiments ofFIGS. 18K-18L. It is further noted that one or more of the embodiments illustrated inFIGS. 18K-18L can be combined (e.g., usingsectionalized dielectric foam1804′ or a helix strip ofdielectric foam1804″ withcores1801′,1801″,1803 or1803′). In some embodiments guided electromagnetic waves propagating in thetransmission mediums1800′,1800″,1800′″, and/or1800″″ ofFIG. 18K may experience less propagation losses than guided electromagnetic waves propagating in thetransmission mediums1800,1820 and1830 ofFIGS. 18A-18C. Additionally, the embodiments illustrated inFIGS. 18K-18L can be adapted to use the connectivity embodiments illustrated inFIGS. 18I-18J.
• Turning now toFIG. 18M, a block diagram illustrating an example, non-limiting embodiment of exposed tapered stubs from the bundledtransmission media1836 for use asantennas1855 is shown. Eachantenna1855 can serve as a directional antenna for radiating wireless signals directed to wireless communication devices or for inducing electromagnetic wave propagation on a surface of a transmission medium (e.g., a power line). In an embodiment, the wireless signals radiated by theantennas1855 can be beam steered by adapting the phase and/or other characteristics of the wireless signals generated by eachantenna1855. In an embodiment, theantennas1855 can individually be placed in a pie-pan antenna assembly for directing wireless signals in various directions.
• It is further noted that the terms “core”, “cladding”, “shell”, and “foam” as utilized in the subject disclosure can comprise any types of materials (or combinations of materials) that enable electromagnetic waves to remain bound to the core while propagating longitudinally along the core. For example, a strip ofdielectric foam1804″ described earlier can be replaced with a strip of an ordinary dielectric material (e.g., polyethylene) for wrapping around the dielectric core1802 (referred to herein for illustration purposes only as a “wrap”). In this configuration an average density of the wrap can be small as a result of air space between sections of the wrap. Consequently, an effective dielectric constant of the wrap can be less than the dielectric constant of thedielectric core1802, thereby enabling guided electromagnetic waves to remain bound to the core. Accordingly, any of the embodiments of the subject disclosure relating to materials used for core(s) and wrappings about the core(s) can be structurally adapted and/or modified with other dielectric materials that achieve the result of maintaining electromagnetic waves bound to the core(s) while they propagate along the core(s). Additionally, a core in whole or in part as described in any of the embodiments of the subject disclosure can comprise an opaque material (e.g., polyethylene) that is resistant to propagation of electromagnetic waves having an optical operating frequency.
• Accordingly, electromagnetic waves guided and bound to the core will have a non-optical frequency range (e.g., less than the lowest frequency of visible light).
• FIGS. 18N, 18O, 18P, 18Q, 18R, 18S and 18T are block diagrams illustrating example, non-limiting embodiments of a waveguide device for transmitting or receiving electromagnetic waves in accordance with various aspects described herein. In an embodiment,FIG. 18N illustrates a front view of awaveguide device1865 having a plurality of slots1863 (e.g., openings or apertures) for emitting electromagnetic waves having radiated electric fields (e-fields)1861. In an embodiment, the radiated e-fields1861 of pairs of symmetrically positioned slots1863 (e.g., north and south slots of the waveguide1865) can be directed away from each other (i.e., polar opposite radial orientations about the cable1862). While theslots1863 are shown as having a rectangular shape, other shapes such as other polygons, sector and arc shapes, ellipsoid shapes and other shapes are likewise possible. For illustration purposes only, the term north will refer to a relative direction as shown in the figures. All references in the subject disclosure to other directions (e.g., south, east, west, northwest, and so forth) will be relative to northern illustration. In an embodiment, to achieve e-fields with opposing orientations at the north andsouth slots1863, for example, the north andsouth slots1863 can be arranged to have a circumferential distance between each other that is approximately one wavelength of electromagnetic waves signals supplied to these slots. Thewaveguide1865 can have a cylindrical cavity in a center of thewaveguide1865 to enable placement of acable1862. In one embodiment, thecable1862 can comprise an insulated conductor. In another embodiment, thecable1862 can comprise an uninsulated conductor. In yet other embodiments, thecable1862 can comprise any of the embodiments of atransmission core1852 ofcable1850 previously described.
• In one embodiment, thecable1862 can slide into the cylindrical cavity of thewaveguide1865. In another embodiment, thewaveguide1865 can utilize an assembly mechanism (not shown). The assembly mechanism (e.g., a hinge or other suitable mechanism that provides a way to open thewaveguide1865 at one or more locations) can be used to enable placement of thewaveguide1865 on an outer surface of thecable1862 or otherwise to assemble separate pieces together to form thewaveguide1865 as shown. According to these and other suitable embodiments, thewaveguide1865 can be configured to wrap around thecable1862 like a collar.
• FIG. 18O illustrates a side view of an embodiment of thewaveguide1865. Thewaveguide1865 can be adapted to have a hollowrectangular waveguide portion1867 that receiveselectromagnetic waves1866 generated by a transmitter circuit as previously described in the subject disclosure (e.g., seeFIGS. 1 and 10A). Theelectromagnetic waves1866 can be distributed by the hollowrectangular waveguide portion1867 into in ahollow collar1869 of thewaveguide1865. Therectangular waveguide portion1867 and thehollow collar1869 can be constructed of materials suitable for maintaining the electromagnetic waves within the hollow chambers of these assemblies (e.g., carbon fiber materials). It should be noted that while thewaveguide portion1867 is shown and described in a hollow rectangular configuration, other shapes and/or other non-hollow configurations can be employed. In particular, thewaveguide portion1867 can have a square or other polygonal cross section, an arc or sector cross section that is truncated to conform to the outer surface of thecable1862, a circular or ellipsoid cross section or cross sectional shape. In addition, thewaveguide portion1867 can be configured as, or otherwise include, a solid dielectric material.
• As previously described, thehollow collar1869 can be configured to emit electromagnetic waves from eachslot1863 withopposite e-fields1861 at pairs of symmetrically positionedslots1863 and1863′. In an embodiment, the electromagnetic waves emitted by the combination ofslots1863 and1863′ can in turn induceelectromagnetic waves1868 on that are bound to thecable1862 for propagation according to a fundamental wave mode without other wave modes present—such as non-fundamental wave modes. In this configuration, theelectromagnetic waves1868 can propagate longitudinally along thecable1862 to other downstream waveguide systems coupled to thecable1862.
• It should be noted that since the hollowrectangular waveguide portion1867 ofFIG. 18O is closer to slot1863 (at the northern position of the waveguide1865),slot1863 can emit electromagnetic waves having a stronger magnitude than electromagnetic waves emitted byslot1863′ (at the southern position). To reduce magnitude differences between these slots,slot1863′ can be made larger thanslot1863. The technique of utilizing different slot sizes to balance signal magnitudes between slots can be applied to any of the embodiments of the subject disclosure relating toFIGS. 18N, 18O, 18Q, 18S, 18U and 18V—some of which are described below.
• In another embodiment,FIG. 18P depicts awaveguide1865′ that can be configured to utilize circuitry such as monolithic microwave integrated circuits (MMICs)1870 each coupled to a signal input1872 (e.g., coaxial cable that provides a communication signal). Thesignal input1872 can be generated by a transmitter circuit as previously described in the subject disclosure (e.g., seereference101,1000 ofFIGS. 1 and 10A) adapted to provide electrical signals to theMMICs1870. EachMMIC1870 can be configured to receivesignal1872 which theMMIC1870 can modulate and transmit with a radiating element (e.g., an antenna) to emit electromagnetic waves having radiated e-fields1861. In one embodiment, theMMICs1870 can be configured to receive thesame signal1872, but transmit electromagneticwaves having e-fields1861 of opposing orientation. This can be accomplished by configuring one of theMMICs1870 to transmit electromagnetic waves that are 180 degrees out of phase with the electromagnetic waves transmitted by theother MMIC1870. In an embodiment, the combination of the electromagnetic waves emitted by theMMICs1870 can together induceelectromagnetic waves1868 that are bound to thecable1862 for propagation according to a fundamental wave mode without other wave modes present—such as non-fundamental wave modes. In this configuration, theelectromagnetic waves1868 can propagate longitudinally along thecable1862 to other downstream waveguide systems coupled to thecable1862.
• A taperedhorn1880 can be added to the embodiments ofFIGS. 18O and 18P to assist in the inducement of theelectromagnetic waves1868 oncable1862 as depicted inFIGS. 18Q and 18R. In an embodiment where thecable1862 is an uninsulated conductor, the electromagnetic waves induced on thecable1862 can have a large radial dimension (e.g., 1 meter). To enable use of a smallertapered horn1880, aninsulation layer1879 can be applied on a portion of thecable1862 at or near the cavity as depicted with hash lines inFIGS. 18Q and 18R. Theinsulation layer1879 can have a tapered end facing away from thewaveguide1865. The added insulation enables theelectromagnetic waves1868 initially launched by the waveguide1865 (or1865′) to be tightly bound to the insulation, which in turn reduces the radial dimension of the electromagnetic fields1868 (e.g., centimeters). As theelectromagnetic waves1868 propagate away from the waveguide1865 (1865′) and reach the tapered end of theinsulation layer1879, the radial dimension of theelectromagnetic waves1868 begin to increase eventually achieving the radial dimension they would have had had theelectromagnetic waves1868 been induced on the uninsulated conductor without an insulation layer. In the illustration ofFIGS. 18Q and 18R the tapered end begins at an end of the taperedhorn1880. In other embodiments, the tapered end of theinsulation layer1879 can begin before or after the end of the taperedhorn1880. The tapered horn can be metallic or constructed of other conductive material or constructed of a plastic or other non-conductive material that is coated or clad with a dielectric layer or doped with a conductive material to provide reflective properties similar to a metallic horn.
• In an embodiment,cable1862 can comprise any of the embodiments ofcable1850 described earlier. In this embodiment,waveguides1865 and1865′ can be coupled to atransmission core1852 ofcable1850 as depicted inFIGS. 18S and 18T. Thewaveguides1865 and1865′ can induce, as previously described,electromagnetic waves1868 on thetransmission core1852 for propagation entirely or partially within inner layers ofcable1850.
• It is noted that for the foregoing embodiments ofFIGS. 18Q, 18R, 18S and 18T,electromagnetic waves1868 can be bidirectional. For example,electromagnetic waves1868 of a different operating frequency can be received byslots1863 orMMICs1870 of thewaveguides1865 and1865′, respectively. Once received, the electromagnetic waves can be converted by a receiver circuit (e.g., seereference101,1000 ofFIGS. 1 and 10A) for generating a communication signal for processing.
• Although not shown, it is further noted that thewaveguides1865 and1865′ can be adapted so that thewaveguides1865 and1865′ can directelectromagnetic waves1868 upstream or downstream longitudinally. For example, a first taperedhorn1880 coupled to a first instance of awaveguide1865 or1865′ can be directed westerly oncable1862, while a second taperedhorn1880 coupled to a second instance of awaveguide1865 or1865′ can be directed easterly oncable1862. The first and second instances of thewaveguides1865 or1865′ can be coupled so that in a repeater configuration, signals received by thefirst waveguide1865 or1865′ can be provided to thesecond waveguide1865 or1865′ for retransmission in an easterly direction oncable1862. The repeater configuration just described can also be applied from an easterly to westerly direction oncable1862.
• Thewaveguide1865 ofFIGS. 18N, 18O, 18Q and 18S can also be configured to generate electromagnetic fields having only non-fundamental or asymmetric wave modes.FIG. 18U depicts an embodiment of awaveguide1865 that can be adapted to generate electromagnetic fields having only non-fundamental wave modes. Amedian line1890 represents a separation between slots where electrical currents on a backside (not shown) of a frontal plate of thewaveguide1865 change polarity. For example, electrical currents on the backside of the frontal plate corresponding to e-fields that are radially outward (i.e., point away from a center point of cable1862) can in some embodiments be associated with slots located outside of the median line1890 (e.g.,slots1863A and1863B). Electrical currents on the backside of the frontal plate corresponding to e-fields that are radially inward (i.e., point towards a center point of cable1862) can in some embodiments be associated with slots located inside of themedian line1890. The direction of the currents can depend on the operating frequency of theelectromagnetic waves1866 supplied to the hollow rectangular waveguide portion1867 (seeFIG. 18O) among other parameters.
• For illustration purposes, assume theelectromagnetic waves1866 supplied to the hollowrectangular waveguide portion1867 have an operating frequency whereby a circumferential distance betweenslots1863A and1863B is one full wavelength of theelectromagnetic waves1866. In this instance, the e-fields of the electromagnetic waves emitted byslots1863A and1863B point radially outward (i.e., have opposing orientations). When the electromagnetic waves emitted byslots1863A and1863B are combined, the resulting electromagnetic waves oncable1862 will propagate according to the fundamental wave mode. In contrast, by repositioning one of the slots (e.g.,slot1863B) inside the media line1890 (i.e.,slot1863C),slot1863C will generate electromagnetic waves that have e-fields that are approximately 180 degrees out of phase with the e-fields of the electromagnetic waves generated byslot1863A. Consequently, the e-field orientations of the electromagnetic waves generated byslot pairs1863A and1863C will be substantially aligned. The combination of the electromagnetic waves emitted byslot pairs1863A and1863C will thus generate electromagnetic waves that are bound to thecable1862 for propagation according to a non-fundamental wave mode.
• To achieve a reconfigurable slot arrangement,waveguide1865 can be adapted according to the embodiments depicted inFIG. 18V. Configuration (A) depicts awaveguide1865 having a plurality of symmetrically positioned slots. Each of theslots1863 of configuration (A) can be selectively disabled by blocking the slot with a material (e.g., carbon fiber or metal) to prevent the emission of electromagnetic waves. A blocked (or disabled)slot1863 is shown in black, while an enabled (or unblocked)slot1863 is shown in white. Although not shown, a blocking material can be placed behind (or in front) of the frontal plate of thewaveguide1865. A mechanism (not shown) can be coupled to the blocking material so that the blocking material can slide in or out of aparticular slot1863 much like closing or opening a window with a cover. The mechanism can be coupled to a linear motor controllable by circuitry of thewaveguide1865 to selectively enable or disableindividual slots1863. With such a mechanism at eachslot1863, thewaveguide1865 can be configured to select different configurations of enabled anddisabled slots1863 as depicted in the embodiments ofFIG. 18V. Other methods or techniques for covering or opening slots (e.g., utilizing rotatable disks behind or in front of the waveguide1865) can be applied to the embodiments of the subject disclosure.
• In one embodiment, thewaveguide system1865 can be configured to enablecertain slots1863 outside themedian line1890 and disablecertain slots1863 inside themedian line1890 as shown in configuration (B) to generate fundamental waves. Assume, for example, that the circumferential distance betweenslots1863 outside the median line1890 (i.e., in the northern and southern locations of the waveguide system1865) is one full wavelength. These slots will therefore have electric fields (e-fields) pointing at certain instances in time radially outward as previously described. In contrast, the slots inside the median line1890 (i.e., in the western and eastern locations of the waveguide system1865) will have a circumferential distance of one-half a wavelength relative to either of theslots1863 outside the median line. Since the slots inside themedian line1890 are half a wavelength apart, such slots will produce electromagnetic waves having e-fields pointing radially outward. If the western andeastern slots1863 outside themedian line1890 had been enabled instead of the western and eastern slots inside themedian line1890, then the e-fields emitted by those slots would have pointed radially inward, which when combined with the electric fields of the northern and southern would produce non-fundamental wave mode propagation. Accordingly, configuration (B) as depicted inFIG. 18V can be used to generate electromagnetic waves at the northern andsouthern slots1863 having e-fields that point radially outward and electromagnetic waves at the western andeastern slots1863 with e-fields that also point radially outward, which when combined induce electromagnetic waves oncable1862 having a fundamental wave mode.
• In another embodiment, thewaveguide system1865 can be configured to enable a northerly, southerly, westerly andeasterly slots1863 all outside themedian line1890, and disable allother slots1863 as shown in configuration (C). Assuming the circumferential distance between a pair of opposing slots (e.g., northerly and southerly, or westerly and easterly) is a full wavelength apart, then configuration (C) can be used to generate electromagnetic waves having a non-fundamental wave mode with some e-fields pointing radially outward and other fields pointing radially inward. In yet another embodiment, thewaveguide system1865 can be configured to enable anorthwesterly slot1863 outside themedian line1890, enable asoutheasterly slot1863 inside themedian line1890, and disable allother slots1863 as shown in configuration (D). Assuming the circumferential distance between such a pair of slots is a full wavelength apart, then such a configuration can be used to generate electromagnetic waves having a non-fundamental wave mode with e-fields aligned in a northwesterly direction.
• In another embodiment, thewaveguide system1865 can be configured to produce electromagnetic waves having a non-fundamental wave mode with e-fields aligned in a southwesterly direction. This can be accomplished by utilizing a different arrangement than used in configuration (D). Configuration (E) can be accomplished by enabling asouthwesterly slot1863 outside themedian line1890, enabling anortheasterly slot1863 inside themedian line1890, and disabling allother slots1863 as shown in configuration (E). Assuming the circumferential distance between such a pair of slots is a full wavelength apart, then such a configuration can be used to generate electromagnetic waves having a non-fundamental wave mode with e-fields aligned in a southwesterly direction. Configuration (E) thus generates a non-fundamental wave mode that is orthogonal to the non-fundamental wave mode of configuration (D).
• In yet another embodiment, thewaveguide system1865 can be configured to generate electromagnetic waves having a fundamental wave mode with e-fields that point radially inward. This can be accomplished by enabling anortherly slot1863 inside themedian line1890, enabling asoutherly slot1863 inside themedian line1890, enabling an easterly slot outside the median1890, enabling awesterly slot1863 outside the median1890, and disabling allother slots1863 as shown in configuration (F). Assuming the circumferential distance between the northerly and southerly slots is a full wavelength apart, then such a configuration can be used to generate electromagnetic waves having a fundamental wave mode with radially inward e-fields. Although the slots selected in configurations (B) and (F) are different, the fundamental wave modes generated by configurations (B) and (F) are the same.
• It yet another embodiment, e-fields can be manipulated between slots to generate fundamental or non-fundamental wave modes by varying the operating frequency of theelectromagnetic waves1866 supplied to the hollowrectangular waveguide portion1867. For example, assume in the illustration ofFIG. 18U that for a particular operating frequency of theelectromagnetic waves1866 the circumferential distance betweenslot1863A and1863B is one full wavelength of theelectromagnetic waves1866. In this instance, the e-fields of electromagnetic waves emitted byslots1863A and1863B will point radially outward as shown, and can be used in combination to induce electromagnetic waves oncable1862 having a fundamental wave mode. In contrast, the e-fields of electromagnetic waves emitted byslots1863A and1863C will be radially aligned (i.e., pointing northerly) as shown, and can be used in combination to induce electromagnetic waves oncable1862 having a non-fundamental wave mode.
• Now suppose that the operating frequency of theelectromagnetic waves1866 supplied to the hollowrectangular waveguide portion1867 is changed so that the circumferential distance betweenslot1863A and1863B is one-half a wavelength of theelectromagnetic waves1866. In this instance, the e-fields of electromagnetic waves emitted byslots1863A and1863B will be radially aligned (i.e., point in the same direction). That is, the e-fields of electromagnetic waves emitted byslot1863B will point in the same direction as the e-fields of electromagnetic waves emitted byslot1863A. Such electromagnetic waves can be used in combination to induce electromagnetic waves oncable1862 having a non-fundamental wave mode. In contrast, the e-fields of electromagnetic waves emitted byslots1863A and1863C will be radially outward (i.e., away from cable1862), and can be used in combination to induce electromagnetic waves oncable1862 having a fundamental wave mode.
• In another embodiment, thewaveguide1865′ ofFIGS. 18P, 18R and 18T can also be configured to generate electromagnetic waves having only non-fundamental wave modes. This can be accomplished by adding more MMICs1870 as depicted inFIG. 18W. EachMMIC1870 can be configured to receive thesame signal input1872. However,MMICs1870 can selectively be configured to emit electromagnetic waves having differing phases using controllable phase-shifting circuitry in eachMMIC1870. For example, the northerly andsoutherly MMICs1870 can be configured to emit electromagnetic waves having a 180 degree phase difference, thereby aligning the e-fields either in a northerly or southerly direction. Any combination of pairs of MMICs1870 (e.g., westerly andeasterly MMICs1870, northwesterly andsoutheasterly MMICs1870, northeasterly and southwesterly MMICs1870) can be configured with opposing or aligned e-fields. Consequently,waveguide1865′ can be configured to generate electromagnetic waves with one or more non-fundamental wave modes, electromagnetic waves with one or more fundamental wave modes, or any combinations thereof.
• It is submitted that it is not necessary to selectslots1863 in pairs to generate electromagnetic waves having a non-fundamental wave mode. For example, electromagnetic waves having a non-fundamental wave mode can be generated by enabling a single slot from the plurality of slots shown in configuration (A) ofFIG. 18V and disabling all other slots. Similarly, asingle MMIC1870 of theMMICs1870 shown inFIG. 18W can be configured to generate electromagnetic waves having a non-fundamental wave mode while allother MMICs1870 are not in use or disabled. Likewise other wave modes and wave mode combinations can be induced by enabling other non-null proper subsets ofwaveguide slots1863 or theMMICs1870.
• It is further submitted that the e-field arrows shown inFIGS. 18U-18V are illustrative only and represent a static depiction of e-fields. In practice, the electromagnetic waves may have oscillating e-fields, which at one instance in time point outwardly, and at another instance in time point inwardly. For example, in the case of non-fundamental wave modes having e-fields that are aligned in one direction (e.g., northerly), such waves may at another instance in time have e-fields that point in an opposite direction (e.g., southerly). Similarly, fundamental wave modes having e-fields that are radial may at one instance have e-fields that point radially away from thecable1862 and at another instance in time point radially towards thecable1862. It is further noted that the embodiments ofFIGS. 18U-18W can be adapted to generate electromagnetic waves with one or more non-fundamental wave modes, electromagnetic waves with one or more fundamental wave modes (e.g., TM00 and HE11 modes), or any combinations thereof. It is further noted that such adaptions can be used in combination with any embodiments described in the subject disclosure. It is also noted that the embodiments ofFIGS. 18U-18W can be combined (e.g., slots used in combination with MMICs).
• It is further noted that in some embodiments, thewaveguide systems1865 and1865′ ofFIGS. 18N-18W may generate combinations of fundamental and non-fundamental wave modes where one wave mode is dominant over the other. For example, in one embodiment electromagnetic waves generated by thewaveguide systems1865 and1865′ ofFIGS. 18N-18W may have a weak signal component that has a non-fundamental wave mode, and a substantially strong signal component that has a fundamental wave mode. Accordingly, in this embodiment, the electromagnetic waves have a substantially fundamental wave mode. In another embodiment electromagnetic waves generated by thewaveguide systems1865 and1865′ ofFIGS. 18N-18W may have a weak signal component that has a fundamental wave mode, and a substantially strong signal component that has a non-fundamental wave mode. Accordingly, in this embodiment, the electromagnetic waves have a substantially non-fundamental wave mode. Further, a non-dominant wave mode may be generated that propagates only trivial distances along the length of the transmission medium.
• It is also noted that thewaveguide systems1865 and1865′ ofFIGS. 18N-18W can be configured to generate instances of electromagnetic waves that have wave modes that can differ from a resulting wave mode or modes of the combined electromagnetic wave. It is further noted that eachMMIC1870 of thewaveguide system1865′ ofFIG. 18W can be configured to generate an instance of electromagnetic waves having wave characteristics that differ from the wave characteristics of another instance of electromagnetic waves generated by anotherMMIC1870. OneMMIC1870, for example, can generate an instance of an electromagnetic wave having a spatial orientation and a phase, frequency, magnitude, electric field orientation, and/or magnetic field orientation that differs from the spatial orientation and phase, frequency, magnitude, electric field orientation, and/or magnetic field orientation of a different instance of another electromagnetic wave generated by anotherMMIC1870. Thewaveguide system1865′ can thus be configured to generate instances of electromagnetic waves having different wave and spatial characteristics, which when combined achieve resulting electromagnetic waves having one or more desirable wave modes.
• From these illustrations, it is submitted that thewaveguide systems1865 and1865′ ofFIGS. 18N-18W can be adapted to generate electromagnetic waves with one or more selectable wave modes. In one embodiment, for example, thewaveguide systems1865 and1865′ can be adapted to select one or more wave modes and generate electromagnetic waves having a single wave mode or multiple wave modes selected and produced from a process of combining instances of electromagnetic waves having one or more configurable wave and spatial characteristics. In an embodiment, for example, parametric information can be stored in a look-up table. Each entry in the look-up table can represent a selectable wave mode. A selectable wave mode can represent a single wave mode, or a combination of wave modes. The combination of wave modes can have one or dominant wave modes. The parametric information can provide configuration information for generating instances of electromagnetic waves for producing resultant electromagnetic waves that have the desired wave mode.
• For example, once a wave mode or modes is selected, the parametric information obtained from the look-up table from the entry associated with the selected wave mode(s) can be used to identify which of one ormore MMICs1870 to utilize, and/or their corresponding configurations to achieve electromagnetic waves having the desired wave mode(s). The parametric information may identify the selection of the one or more MMICs1870 based on the spatial orientations of theMMICs1870, which may be required for producing electromagnetic waves with the desired wave mode. The parametric information can also provide information to configure each of the one or more MMICs1870 with a particular phase, frequency, magnitude, electric field orientation, and/or magnetic field orientation which may or may not be the same for each of the selectedMMICs1870. A look-up table with selectable wave modes and corresponding parametric information can be adapted for configuring the slottedwaveguide system1865.
• In some embodiments, a guided electromagnetic wave can be considered to have a desired wave mode if the corresponding wave mode propagates non-trivial distances on a transmission medium and has a field strength that is substantially greater in magnitude (e.g., 20 dB higher in magnitude) than other wave modes that may or may not be desirable. Such a desired wave mode or modes can be referred to as dominant wave mode(s) with the other wave modes being referred to as non-dominant wave modes. In a similar fashion, a guided electromagnetic wave that is said to be substantially without the fundamental wave mode has either no fundamental wave mode or a non-dominant fundamental wave mode. A guided electromagnetic wave that is said to be substantially without a non-fundamental wave mode has either no non-fundamental wave mode(s) or only non-dominant non-fundamental wave mode(s). In some embodiments, a guided electromagnetic wave that is said to have only a single wave mode or a selected wave mode may have only one corresponding dominant wave mode.
• It is further noted that the embodiments ofFIGS. 18U-18W can be applied to other embodiments of the subject disclosure. For example, the embodiments ofFIGS. 18U-18W can be used as alternate embodiments to the embodiments depicted inFIGS. 18N-18T or can be combined with the embodiments depicted inFIGS. 18N-18T.
• Turning now toFIGS. 19A and 19B, block diagrams illustrating example, non-limiting embodiments of a dielectric antenna and corresponding gain and field intensity plots in accordance with various aspects described herein are shown.FIG. 19A depicts adielectric horn antenna1901 having a conical structure. Thedielectric horn antenna1901 is coupled to oneend1902′ of afeedline1902 having afeed point1902″ at an opposite end of thefeedline1902. Thedielectric horn antenna1901 and the feedline1902 (as well as other embodiments of the dielectric antenna described below in the subject disclosure) can be constructed of dielectric materials such as a polyethylene material, a polyurethane material or other suitable dielectric material (e.g., a synthetic resin, other plastics, etc.). Thedielectric horn antenna1901 and the feedline1902 (as well as other embodiments of the dielectric antenna described below in the subject disclosure) can be adapted to be substantially or entirely devoid of any conductive materials.
• For example, theexternal surfaces1907 of thedielectric horn antenna1901 and thefeedline1902 can be non-conductive or substantially non-conductive with at least 95% of the external surface area being non-conductive and the dielectric materials used to construct thedielectric horn antenna1901 and thefeedline1902 can be such that they substantially do not contain impurities that may be conductive (e.g., such as less than 1 part per thousand) or result in imparting conductive properties. In other embodiments, however, a limited number of conductive components can be used such as a metallic connector component used for coupling to thefeed point1902″ of thefeedline1902 with one or more screws, rivets or other coupling elements used to bind components to one another, and/or one or more structural elements that do not significantly alter the radiation pattern of the dielectric antenna.
• Thefeed point1902″ can be adapted to couple to acore1852 such as previously described by way of illustration inFIGS. 18I and 18J. In one embodiment, thefeed point1902″ can be coupled to thecore1852 utilizing a joint (not shown inFIG. 19A) such as thesplicing device1860 ofFIG. 18J. Other embodiments for coupling thefeed point1902″ to thecore1852 can be used. In an embodiment, the joint can be configured to cause thefeed point1902″ to touch an endpoint of thecore1852. In another embodiment, the joint can create a gap between thefeed point1902″ and an end of thecore1852. In yet another embodiment, the joint can cause thefeed point1902″ and thecore1852 to be coaxially aligned or partially misaligned. Notwithstanding any combination of the foregoing embodiments, electromagnetic waves can in whole or at least in part propagate between the junction of thefeed point1902″ and thecore1852.
• Thecable1850 can be coupled to thewaveguide system1865 depicted inFIG. 18S or thewaveguide system1865′ depicted inFIG. 18T. For illustration purposes only, reference will be made to thewaveguide system1865′ ofFIG. 18T. It is understood, however, that thewaveguide system1865 ofFIG. 18S or other waveguide systems can also be utilized in accordance with the discussions that follow. Thewaveguide system1865′ can be configured to select a wave mode (e.g., non-fundamental wave mode, fundamental wave mode, a hybrid wave mode, or combinations thereof as described earlier) and transmit instances of electromagnetic waves having a non-optical operating frequency (e.g., 60 GHz). The electromagnetic waves can be directed to an interface of thecable1850 as shown inFIG. 18T.
• The instances of electromagnetic waves generated by thewaveguide system1865′ can induce a combined electromagnetic wave having the selected wave mode that propagates from thecore1852 to thefeed point1902″. The combined electromagnetic wave can propagate partly inside thecore1852 and partly on an outer surface of thecore1852. Once the combined electromagnetic wave has propagated through the junction between the core1852 and thefeed point1902″, the combined electromagnetic wave can continue to propagate partly inside thefeedline1902 and partly on an outer surface of thefeedline1902. In some embodiments, the portion of the combined electromagnetic wave that propagates on the outer surface of thecore1852 and thefeedline1902 is small. In these embodiments, the combined electromagnetic wave can be said to be guided by and tightly coupled to thecore1852 and thefeedline1902 while propagating longitudinally towards thedielectric antenna1901.
• When the combined electromagnetic wave reaches a proximal portion of the dielectric antenna1901 (at ajunction1902′ between thefeedline1902 and the dielectric antenna1901), the combined electromagnetic wave enters the proximal portion of thedielectric antenna1901 and propagates longitudinally along an axis of the dielectric antenna1901 (shown as a hashed line). By the time the combined electromagnetic wave reaches theaperture1903, the combined electromagnetic wave has an intensity pattern similar to the one shown by the side view and front view depicted inFIG. 19B. The electric field intensity pattern ofFIG. 19B shows that the electric fields of the combined electromagnetic waves are strongest in a center region of theaperture1903 and weaker in the outer regions. In an embodiment, where the wave mode of the electromagnetic waves propagating in thedielectric antenna1901 is a hybrid wave mode (e.g., HE11), the leakage of the electromagnetic waves at theexternal surfaces1907 is reduced or in some instances eliminated. It is further noted that while thedielectric antenna1901 is constructed of a solid dielectric material having no physical opening, the front or operating face of thedielectric antenna1901 from which free space wireless signals are radiated or received will be referred to as theaperture1903 of thedielectric antenna1901 even though in some prior art systems the term aperture may be used to describe an opening of an antenna that radiates or receives free space wireless signals. Methods for launching a hybrid wave mode oncable1850 is discussed below.
• In an embodiment, the far-field antenna gain pattern depicted inFIG. 19B can be widened by decreasing the operating frequency of the combined electromagnetic wave from a nominal frequency. Similarly, the gain pattern can be narrowed by increasing the operating frequency of the combined electromagnetic wave from the nominal frequency. Accordingly, a width of a beam of wireless signals emitted by theaperture1903 can be controlled by configuring thewaveguide system1865′ to increase or decrease the operating frequency of the combined electromagnetic wave.
• Thedielectric antenna1901 ofFIG. 19A can also be used for receiving wireless signals, such as free space wireless signals transmitted by either a similar antenna or conventional antenna design. Wireless signals received by thedielectric antenna1901 at theaperture1903 induce electromagnetic waves in thedielectric antenna1901 that propagate towards thefeedline1902. The electromagnetic waves continue to propagate from thefeedline1902 to the junction between thefeed point1902″ and an endpoint of thecore1852, and are thereby delivered to thewaveguide system1865′ coupled to thecable1850 as shown inFIG. 18T. In this configuration, thewaveguide system1865′ can perform bidirectional communications utilizing thedielectric antenna1901. It is further noted that in some embodiments thecore1852 of the cable1850 (shown with dashed lines) can be configured to be collinear with thefeed point1902″ to avoid a bend shown inFIG. 19A. In some embodiments, a collinear configuration can reduce an alteration in the propagation of the electromagnetic due to the bend incable1850.
• Turning now toFIGS. 19C and 19D, block diagrams illustrating example, non-limiting embodiments of adielectric antenna1901 coupled to or integrally constructed with alens1912 and corresponding gain and field intensity plots in accordance with various aspects described herein are shown. In one embodiment, thelens1912 can comprise a dielectric material having a first dielectric constant that is substantially similar or equal to a second dielectric constant of thedielectric antenna1901. In other embodiments, thelens1912 can comprise a dielectric material having a first dielectric constant that differs from a second dielectric constant of thedielectric antenna1901. In either of these embodiments, the shape of thelens1912 can be chosen or formed so as to equalize the delays of the various electromagnetic waves propagating at different points in thedielectric antenna1901. In one embodiment, thelens1912 can be an integral part of thedielectric antenna1901 as depicted in the top diagram ofFIG. 19C and in particular, the lens anddielectric antenna1901 can be molded, machined or otherwise formed from a single piece of dielectric material. Alternatively, thelens1912 can be an assembly component of thedielectric antenna1901 as depicted in the bottom diagram ofFIG. 19C, which can be attached by way of an adhesive material, brackets on the outer edges, or other suitable attachment techniques. Thelens1912 can have a convex structure as shown inFIG. 19C which is adapted to adjust a propagation of electromagnetic waves in thedielectric antenna1901. While a round lens and conical dielectric antenna configuration is shown, other shapes include pyramidal shapes, elliptical shapes and other geometric shapes can likewise be implemented.
• In particular, the curvature of thelens1912 can be chosen in manner that reduces phase differences between near-field wireless signals generated by theaperture1903 of thedielectric antenna1901. Thelens1912 accomplishes this by applying location-dependent delays to propagating electromagnetic waves. Because of the curvature of thelens1912, the delays differ depending on where the electromagnetic waves emanate from at theaperture1903. For example, electromagnetic waves propagating by way of acenter axis1905 of thedielectric antenna1901 will experience more delay through thelens1912 than electromagnetic waves propagating radially away from thecenter axis1905. Electromagnetic waves propagating towards, for example, the outer edges of theaperture1903 will experience minimal or no delay through the lens. Propagation delay increases as the electromagnetic waves get close to thecenter axis1905. Accordingly, a curvature of thelens1912 can be configured so that near-field wireless signals have substantially similar phases. By reducing differences between phases of the near-field wireless signals, a width of far-field signals generated by thedielectric antenna1901 is reduced, which in turn increases the intensity of the far-field wireless signals within the width of the main lobe as shown by the far-field intensity plot shown inFIG. 19D, producing a relatively narrow beam pattern with high gain.
• Turning now toFIGS. 19E and 19F, block diagrams illustrating example, non-limiting embodiments of adielectric antenna1901 coupled to alens1912 with ridges (or steps)1914 and corresponding gain and field intensity plots in accordance with various aspects described herein are shown. In these illustration, thelens1912 can compriseconcentric ridges1914 shown in the side and perspective views ofFIG. 19E. Eachridge1914 can comprise ariser1916 and atread1918. The size of thetread1918 changes depending on the curvature of theaperture1903. For example, thetread1918 at the center of theaperture1903 can be greater than the tread at the outer edges of theaperture1903. To reduce reflections of electromagnetic waves that reach theaperture1903, eachriser1916 can be configured to have a depth representative of a select wavelength factor. For example, ariser1916 can be configured to have a depth of one-quarter a wavelength of the electromagnetic waves propagating in thedielectric antenna1901. Such a configuration causes the electromagnetic wave reflected from oneriser1916 to have a phase difference of 180 degrees relative to the electromagnetic wave reflected from anadjacent riser1916. Consequently, the out of phase electromagnetic waves reflected from theadjacent risers1916 substantially cancel, thereby reducing reflection and distortion caused thereby. While a particular riser/tread configuration is shown, other configurations with a differing number of risers, differing riser shapes, etc. can likewise be implemented. In some embodiments, thelens1912 with concentric ridges depicted inFIG. 19E may experience less electromagnetic wave reflections than thelens1912 having the smooth convex surface depicted inFIG. 19C.FIG. 19F depicts the resulting far-field gain plot of thedielectric antenna1901 ofFIG. 19E.
• Turning now toFIG. 19G, a block diagram illustrating an example, non-limiting embodiment of adielectric antenna1901 having an elliptical structure in accordance with various aspects described herein is shown.FIG. 19G depicts a side view, top view, and front view of thedielectric antenna1901. The elliptical shape is achieved by reducing a height of thedielectric antenna1901 as shown byreference1922 and by elongating thedielectric antenna1901 as shown byreference1924. The resultingelliptical shape1926 is shown in the front view depicted byFIG. 19G. The elliptical shape can be formed, via machining, with a mold tool or other suitable construction technique.
• Turning now toFIG. 19H, a block diagram illustrating an example, non-limiting embodiment of near-field signals1928 and far-field signals1930 emitted by thedielectric antenna1901 ofFIG. 19G in accordance with various aspects described herein is shown. The cross section of the near-field beam pattern1928 mimics the elliptical shape of theaperture1903 of thedielectric antenna1901. The cross section of the far-field beam pattern1930 have a rotational offset (approximately 90 degrees) that results from the elliptical shape of the near-field signals1928. The offset can be determined by applying a Fourier Transform to the near-field signals1928. While the cross section of the near-field beam pattern1928 and the cross section of the far-field beam pattern1930 are shown as nearly the same size in order to demonstrate the rotational effect, the actual size of the far-field beam pattern1930 may increase with the distance from thedielectric antenna1901.
• The elongated shape of the far-field signals1930 and its orientation can prove useful when aligning adielectric antenna1901 in relation to a remotely located receiver configured to receive the far-field signals1930. The receiver can comprise one or more dielectric antennas coupled to a waveguide system such as described by the subject disclosure. The elongated far-field signals1930 can increase the likelihood that the remotely located receiver will detect the far-field signals1930. In addition, the elongated far-field signals1930 can be useful in situations where adielectric antenna1901 coupled to a gimbal assembly such as shown inFIG. 19M, or other actuated antenna mount including but not limited to the actuated gimbal mount described in the co-pending application entitled, COMMUNICATION DEVICE AND ANTENNA ASSEMBLY WITH ACTUATED GIMBAL MOUNT, having Attorney Docket no. 2015-0603_7785-1210, and U.S. patent application Ser. No. 14/873,241, filed on Oct. 2, 2015 the contents of which are incorporated herein by reference for any and all purposes. In particular, the elongated far-field signals1930 can be useful in situations where such as gimbal mount only has two degrees of freedom for aligning thedielectric antenna1901 in the direction of the receiver (e.g., yaw and pitch is adjustable but roll is fixed).
• Although not shown, it will be appreciated that thedielectric antenna1901 ofFIGS. 19G and 19H can have an integrated orattachable lens1912 such as shown inFIGS. 19C and 19E to increase an intensity of the far-fields signals1930 by reducing phase differences in the near-field signals.
• Turning now toFIG. 19I, block diagrams of example, non-limiting embodiments of adielectric antenna1901 for adjusting far-field wireless signals in accordance with various aspects described herein are shown. In some embodiments, a width of far-field wireless signals generated by thedielectric antenna1901 can be said to be inversely proportional to a number of wavelengths of the electromagnetic waves propagating in thedielectric antenna1901 that can fit in a surface area of theaperture1903 of thedielectric antenna1901. Hence, as the wavelengths of the electromagnetic waves increases, the width of the far-field wireless signals increases (and its intensity decreases) proportionately. Put another way, when the frequency of the electromagnetic waves decreases, the width of the far-field wireless signals increases proportionately. Accordingly, to enhance a process of aligning adielectric antenna1901 using, for example, the gimbal assembly shown inFIG. 19M or other actuated antenna mount, in a direction of a receiver, the frequency of the electromagnetic waves supplied to thedielectric antenna1901 by way of thefeedline1902 can be decreased so that the far-field wireless signals are sufficiently wide to increase a likelihood that the receiver will detect a portion of the far-field wireless signals.
• In some embodiments, the receiver can be configured to perform measurements on the far-field wireless signals. From these measurements the receiver can direct a waveguide system coupled to thedielectric antenna1901 generating the far-field wireless signals. The receiver can provide instructions to the waveguide system by way of an omnidirectional wireless signal or a tethered interface therebetween. The instructions provided by the receiver can result in the waveguide system controlling actuators in the gimbal assembly coupled to thedielectric antenna1901 to adjust a direction of thedielectric antenna1901 to improve its alignment to the receiver. As the quality of the far-field wireless signals improves, the receiver can also direct the waveguide system to increase a frequency of the electromagnetic waves, which in turn reduces a width of the far-field wireless signals and correspondingly increases its intensity.
• In an alternative embodiment,absorption sheets1932 constructed from carbon or conductive materials and/or other absorbers can be embedded in thedielectric antenna1901 as depicted by the perspective and front views shown inFIG. 19I. When the electric fields of the electromagnetic waves are parallel with theabsorption sheets1932, the electromagnetic waves are absorbed. Aclearance region1934 whereabsorption sheets1932 are not present will, however, allow the electromagnetic waves to propagate to theaperture1903 and thereby emit near-field wireless signals having approximately the width of theclearance region1934. By reducing the number of wavelengths to a surface area of theclearance region1932, the width of the near-field wireless signals is decreases, while the width of the far-field wireless signals is increased. This property can be useful during the alignment process previously described.
• For example, at the onset of an alignment process, the polarity of the electric fields emitted by the electromagnetic waves can be configured to be parallel with theabsorption sheets1932. As the remotely located receiver instructs a waveguide system coupled to thedielectric antenna1901 to direct thedielectric antenna1901 using the actuators of a gimbal assembly or other actuated mount, it can also instruct the waveguide system to incrementally adjust the alignment of the electric fields of the electromagnetic waves relative to theabsorption sheets1932 as signal measurements performed by the receiver improve. As the alignment improves, eventually waveguide system adjusts the electric fields so that they are orthogonal to theabsorption sheets1932. At this point, the electromagnetic waves near theabsorption sheets1932 will no longer be absorbed, and all or substantially all electromagnetic waves will propagate to theaperture1903. Since the near-field wireless signals now cover all or substantially all of theaperture1903, the far-field signals will have a narrower width and higher intensity as they are directed to the receiver.
• It will be appreciated that the receiver configured to receive the far-field wireless signals (as described above) can also be configured to utilize a transmitter that can transmit wireless signals directed to thedielectric antenna1901 utilized by the waveguide system. For illustration purposes, such a receiver will be referred to as a remote system that can receive far-field wireless signals and transmit wireless signals directed to the waveguide system. In this embodiment, the waveguide system can be configured to analyze the wireless signals it receives by way of thedielectric antenna1901 and determine whether a quality of the wireless signals generated by the remote system justifies further adjustments to the far-field signal pattern to improve reception of the far-field wireless signals by the remote system, and/or whether further orientation alignment of the dielectric antenna by way of the gimbal (seeFIG. 19M) or other actuated mount is needed. As the quality of a reception of the wireless signals by the waveguide system improves, the waveguide system can increase the operating frequency of the electromagnetic waves, which in turn reduces a width of the far-field wireless signals and correspondingly increases its intensity. In other modes of operation, the gimbal or other actuated mount can be periodically adjusted to maintain an optimal alignment.
• The foregoing embodiments ofFIG. 19I can also be combined. For example, the waveguide system can perform adjustments to the far-field signal pattern and/or antenna orientation adjustments based on a combination of an analysis of wireless signals generated by the remote system and messages or instructions provided by the remote system that indicate a quality of the far-field signals received by the remote system.
• Turning now toFIG. 19J, block diagrams of example, non-limiting embodiments of a collar such as aflange1942 that can be coupled to adielectric antenna1901 in accordance with various aspects described herein is shown. The flange can be constructed with metal (e.g., aluminum) dielectric material (e.g., polyethylene and/or foam), or other suitable materials. Theflange1942 can be utilized to align thefeed point1902″ (and in some embodiments also the feedline1902) with a waveguide system1948 (e.g., a circular waveguide) as shown inFIG. 19K. To accomplish this, theflange1942 can comprise acenter hole1946 for engaging with thefeed point1902″. In one embodiment, thehole1946 can be threaded and thefeedline1902 can have a smooth surface. In this embodiment, theflange1942 can engage thefeed point1902″ (constructed of a dielectric material such as polyethylene) by inserting a portion of thefeed point1902″ into thehole1946 and rotating theflange1942 to act as a die to form complementary threads on the soft outer surface of thefeedline1902.
• Once thefeedline1902 has been threaded by or into theflange1942, thefeed point1902″ and portion of thefeedline1902 extending from theflange1942 can be shortened or lengthened by rotating theflange1942 accordingly. In other embodiments thefeedline1902 can be pre-threaded with mating threads for engagement with theflange1942 for improving the ease of engaging it with theflange1942. In yet other embodiments, thefeedline1902 can have a smooth surface and thehole1946 of theflange1942 can be non-threaded. In this embodiment, thehole1946 can have a diameter that is similar to diameter of thefeedline1902 such as to cause the engagement of thefeedline1902 to be held in place by frictional forces.
• For alignment purposes, theflange1942 the can further include threadedholes1944 accompanied by two ormore alignment holes1947, which can be used to align tocomplementary alignment pins1949 of thewaveguide system1948, which in turn assist in aligningholes1944′ of thewaveguide system1948 to the threadedholes1944 of the flange1942 (seeFIGS. 19K-19L). Once theflange1942 has been aligned to thewaveguide system1948, theflange1942 andwaveguide system1948 can be secured to each other with threadedscrews1950 resulting in a completed assembly depicted inFIG. 19L. In a threaded design, thefeed point1902″ of thefeedline1902 can be adjusted inwards or outwards in relation to aport1945 of thewaveguide system1948 from which electromagnetic waves are exchanged. The adjustment enables thegap1943 between thefeed point1902″ and theport1945 to be increased or decreased. The adjustment can be used for tuning a coupling interface between thewaveguide system1948 and thefeed point1902″ of thefeedline1902.FIG. 19L also shows how theflange1942 can be used to align thefeedline1902 with coaxially aligneddielectric foam sections1951 held by a tubularouter jacket1952. The illustration inFIG. 19L is similar to thetransmission medium1800′ illustrated inFIG. 18K. To complete the assembly process, theflange1942 can be coupled to awaveguide system1948 as depicted inFIG. 19L.
• Turning now toFIG. 19N, a block diagram of an example, non-limiting embodiment of adielectric antenna1901′ in accordance with various aspects described herein is shown.FIG. 19N depicts an array of pyramidal-shapeddielectric horn antennas1901′, each having a correspondingaperture1903′. Each antenna of the array of pyramidal-shapeddielectric horn antennas1901′ can have afeedline1902 with acorresponding feed point1902″ that couples to eachcorresponding core1852 of a plurality ofcables1850. Eachcable1850 can be coupled to a different (or a same)waveguide system1865′ such as shown inFIG. 18T. The array of pyramidal-shapeddielectric horn antennas1901′ can be used to transmit wireless signals having a plurality of spatial orientations. An array of pyramidal-shapeddielectric horn antennas1901′ covering 360 degrees can enable a one ormore waveguide systems1865′ coupled to the antennas to perform omnidirectional communications with other communication devices or antennas of similar type.
• The bidirectional propagation properties of electromagnetic waves previously described for thedielectric antenna1901 ofFIG. 19A are also applicable for electromagnetic waves propagating from thecore1852 to thefeed point1902″ guided by thefeedline1902 to theaperture1903′ of the pyramidal-shapeddielectric horn antennas1901′, and in the reverse direction. Similarly, the array of pyramidal-shapeddielectric horn antennas1901′ can be substantially or entirely devoid of conductive external surfaces and internal conductive materials as discussed above. For example, in some embodiments, the array of pyramidal-shapeddielectric horn antennas1901′ and theircorresponding feed points1902′ can be constructed of dielectric-only materials such as polyethylene or polyurethane materials or with only trivial amounts of conductive material that does not significantly alter the radiation pattern of the antenna.
• It is further noted that each antenna of the array of pyramidal-shapeddielectric horn antennas1901′ can have similar gain and electric field intensity maps as shown for thedielectric antenna1901 inFIG. 19B. Each antenna of the array of pyramidal-shapeddielectric horn antennas1901′ can also be used for receiving wireless signals as previously described for thedielectric antenna1901 ofFIG. 19A. In some embodiments, a single instance of a pyramidal-shaped dielectric horn antenna can be used. Similarly, multiple instances of thedielectric antenna1901 ofFIG. 19A can be used in an array configuration similar to the one shown inFIG. 19N.
• Turning now toFIG. 19O, block diagrams of example, non-limiting embodiments of anarray1976 ofdielectric antennas1901 configurable for steering wireless signals in accordance with various aspects described herein is shown. Thearray1976 ofdielectric antennas1901 can be conical shapedantennas1901 or pyramidal-shapeddielectric antennas1901′. To perform beam steering, a waveguide system coupled to thearray1976 ofdielectric antennas1901 can be adapted to utilize acircuit1972 comprisingamplifiers1973 andphase shifters1974, each pair coupled to one of thedielectric antennas1901 in thearray1976. The waveguide system can steer far-field wireless signals from left to right (west to east) by incrementally increasing a phase delay of signals supplied to thedielectric antennas1901.
• For example, the waveguide system can provide a first signal to the dielectric antennas of column 1 (“C1”) having no phase delay. The waveguide system can further provide a second signal to column 2 (“C2”), the second signal comprising the first signal having a first phase delay. The waveguide system can further provide a third signal to the dielectric antennas of column 3 (“C3”), the third signal comprising the second signal having a second phase delay. Lastly, the waveguide system can provide a fourth signal to the dielectric antennas of column 4 (“C4”), the fourth signal comprising the third signal having a third phase delay. These phase shifted signals will cause far-field wireless signals generated by the array to shift from left to right. Similarly, far-field signals can be steered from right to left (east to west) (“C4” to C1), north to south (“R1” to “R4”), south to north (“R4” to “R1”), and southwest to northeast (“C1-R4” to “C4-R1”).
• Utilizing similar techniques beam steering can also be performed in other directions such as southwest to northeast by configuring the waveguide system to incrementally increase the phase of signals transmitted by the following sequence of antennas: “C1-R4”, “C1-R3/C2-R4”, “C1-R2/C2-R3/C3-R4”, “C1-R1/C2-R2/C3-R3/C4-R4”, “C2-R1/C3-R2/C4-R3”, “C3-R1/C4-R2”, “C4-R1”. In a similar way, beam steering can be performed northeast to southwest, northwest to southeast, southeast to northwest, as well in other directions in three-dimensional space. Beam steering can be used, among other things, for aligning thearray1976 ofdielectric antennas1901 with a remote receiver and/or for directivity of signals to mobile communication devices. In some embodiments, a phasedarray1976 ofdielectric antennas1901 can also be used to circumvent the use of the gimbal assembly ofFIG. 19M or other actuated mount. While the foregoing has described beam steering controlled by phase delays, gain and phase adjustment can likewise be applied to thedielectric antennas1901 of the phasedarray1976 in a similar fashion to provide additional control and versatility in the formation of a desired beam pattern.
• Turning now to FIGS.19P1-19P8, side-view block diagrams of example, non-limiting embodiments of a cable, a flange, and dielectric antenna assembly in accordance with various aspects described herein are shown. FIG.19P1 depicts acable1850 such as described earlier, which includes atransmission core1852. Thetransmission core1852 can comprise adielectric core1802, aninsulated conductor1825, abare conductor1832, acore1842, or ahollow core1842′ as depicted in thetransmission mediums1800,1820,1830,1836,1841 and/or1843 ofFIGS. 18A-18D, and 18F-18H, respectively. Thecable1850 can further include a shell (such as a dielectric shell) covered by an outer jacket such as shown inFIGS. 18A-18C. In some embodiments, the outer jacket can be conductorless (e.g., polyethylene or equivalent). In other embodiments, the outer jacket can be a conductive shield which can reduce leakage of the electromagnetic waves propagating along thetransmission core1852.
• In some embodiments, one end of thetransmission core1852 can be coupled to aflange1942 as previously described in relation toFIGS. 19J-19L. As noted above, theflange1942 can enable thetransmission core1852 of thecable1850 to be aligned with afeed point1902 of thedielectric antenna1901. In some embodiments, thefeed point1902 can be constructed of the same material as thetransmission core1852. For example, in one embodiment thetransmission core1852 can comprise a dielectric core, and thefeed point1902 can comprise a dielectric material also. In this embodiment, the dielectric constants of thetransmission core1852 and thefeed point1902 can be similar or can differ by a controlled amount. The difference in dielectric constants can be controlled to tune the interface between thetransmission core1852 and thefeed point1902 for the exchange of electromagnetic waves propagating therebetween. In other embodiments, thetransmission core1852 may have a different construction than thefeed point1902. For example, in one embodiment thetransmission core1852 can comprise an insulated conductor, while thefeed point1902 comprises a dielectric material devoid of conductive materials.
• As shown inFIG. 19J, thetransmission core1852 can be coupled to theflange1942 via acenter hole1946, although in other embodiments it will be appreciated that such a hole could be off-centered as well. In one embodiment, thehole1946 can be threaded and thetransmission core1852 can have a smooth surface. In this embodiment, theflange1942 can engage thetransmission core1852 by inserting a portion of thetransmission core1852 into thehole1946 and rotating theflange1942 to act as a die to form complementary threads on the outer surface of thetransmission core1852. Once thetransmission core1852 has been threaded by or into theflange1942, the portion of thetransmission core1852 extending from theflange1942 can be shortened or lengthened by rotating theflange1942 accordingly.
• In other embodiments thetransmission core1852 can be pre-threaded with mating threads for engagement with thehole1946 of theflange1942 for improving the ease of engaging thetransmission core1852 with theflange1942. In yet other embodiments, thetransmission core1852 can have a smooth surface and thehole1946 of theflange1942 can be non-threaded. In this embodiment, thehole1946 can have a diameter that is similar to the diameter of thetransmission core1852 such as to cause the engagement of thetransmission core1852 to be held in place by frictional forces. It will be appreciated that there can be several other ways of engaging thetransmission core1852 with theflange1942, including various clips, fusion, compression fittings, and the like. Thefeed point1902 of thedielectric antenna1901 can be engaged with the other side of thehole1946 of theflange1942 in the same manner as described fortransmission core1852.
• Agap1943 can exist between thetransmission core1852 and thefeed point1902. Thegap1943, however, can be adjusted in an embodiment by rotating thefeed point1902 while thetransmission core1852 is held in place or vice-versa. In some embodiments, the ends of thetransmission core1852 and thefeed point1902 engaged with theflange1942 can be adjusted so that they touch, thereby removing thegap1943. In other embodiments, the ends of thetransmission core1852 or thefeed point1902 engaged with theflange1942 can intentionally be adjusted to create a specific gap size. The adjustability of thegap1943 can provide another degree of freedom to tune the interface between thetransmission core1852 and thefeed point1902.
• Although not shown in FIGS.19P1-19P8, an opposite end of thetransmission core1852 ofcable1850 can be coupled to a waveguide device such as depicted inFIGS. 18S and 18T utilizing anotherflange1942 and similar coupling techniques. The waveguide device can be used for transmitting and receiving electromagnetic waves along thetransmission core1852. Depending on the operational parameters of the electromagnetic waves (e.g., operating frequency, wave mode, etc.), the electromagnetic waves can propagate within thetransmission core1852, on an outer surface of thetransmission core1852, or partly within thetransmission core1852 and the outer surface of thetransmission core1852. When the waveguide device is configured as a transmitter, the signals generated thereby induce electromagnetic waves that propagate along thetransmission core1852 and transition to thefeed point1902 at the junction therebetween. The electromagnetic waves then propagate from thefeed point1902 into thedielectric antenna1901 becoming wireless signals at theaperture1903 of thedielectric antenna1901.
• Aframe1982 can be used to surround all or at least a substantial portion of the outer surfaces of the dielectric antenna1901 (except the aperture1903) to improve transmission or reception of and/or reduce leakage of the electromagnetic waves as they propagate towards theaperture1903. In some embodiments, aportion1984 of theframe1982 can extend to thefeed point1902 as shown in FIG.19P2 to prevent leakage on the outer surface of thefeed point1902. Theframe1982, for example, can be constructed of materials (e.g., conductive or carbon materials) that reduce leakage of the electromagnetic waves. The shape of theframe1982 can vary based on a shape of thedielectric antenna1901. For example, theframe1852 can have a flared straight-surface shape as shown in FIGS.19P1-19P4. Alternatively, theframe1852 can have a flared parabolic-surface shape as shown in FIGS.19P5-19P8. It will be appreciated that theframe1852 can have other shapes.
• Theaperture1903 can be of different shapes and sizes. In one embodiment, for example, theaperture1903 can utilize a lens having aconvex structure1983 of various dimensions as shown in FIGS.19P1,19P4, and19P6-19P8. In other embodiments, theaperture1903 can have aflat structure1985 of various dimensions as shown in FIGS.19P2 and19P5. In yet other embodiments, theaperture1903 can utilize a lens having apyramidal structure1986 as shown in FIGS.19P3 and19Q1. The lens of theaperture1903 can be an integral part of thedielectric antenna1901 or can be a component that is coupled to thedielectric antenna1901 as shown inFIG. 19C. Additionally, the lens of theaperture1903 can be constructed with the same or a different material than thedielectric antenna1901. Also, in some embodiments, theaperture1903 of thedielectric antenna1901 can extend outside theframe1982 as shown in FIGS.19P7-19P8 or can be confined within theframe1982 as shown in FIGS.19P1-19P6.
• In one embodiment, the dielectric constant of the lens of theapertures1903 shown in FIGS.19P1-19P8 can be configured to be substantially similar or different from that of thedielectric antenna1901. Additionally, one or more internal portions of thedielectric antenna1901, such assection1986 of FIG.19P4, can have a dielectric constant that differs from that of the remaining portions of the dielectric antenna. The surface of the lens of theapertures1903 shown in FIGS.19P1-19P8 can have a smooth surface or can have ridges such as shown inFIG. 19E to reduce surface reflections of the electromagnetic waves as previously described.
• Depending on the shape of thedielectric antenna1901, theframe1982 can be of different shapes and sizes as shown in the front views depicted in FIGS.19Q1,19Q2 and19Q3. For example, theframe1982 can have a pyramidal shape as shown in FIG.19Q1. In other embodiments, theframe1982 can have a circular shape as depicted in FIG.19Q2. In yet other embodiments, theframe1982 can have an elliptical shape as depicted in FIG.19Q3.
• The embodiments of FIGS.19P1-19P8 and19Q1-19Q3 can be combined in whole or in part with each other to create other embodiments contemplated by the subject disclosure. Additionally, the embodiments of FIGS.19P1-19P8 and19Q1-19Q3 can be combined with other embodiments of the subject disclosure. For example, the multi-antenna assembly ofFIG. 20F can be adapted to utilize any one of the embodiments of FIGS.19P1-19P8 and19Q1-19Q3. Additionally, multiple instances of a multi-antenna assembly adapted to utilize one of the embodiments of FIGS.19P1-19P819Q1-19Q3 can be stacked on top of each other to form a phased array that functions similar to the phased array ofFIG. 19O. In other embodiments,absorption sheets1932 can be added to thedielectric antenna1901 as shown inFIG. 19I to control the widths of near-field and far-field signals. Other combinations of the embodiments of FIGS.19P1-19P8 and19Q1-19Q3 and the embodiments of the subject disclosure are contemplated.
• Turning now toFIGS. 20A and 20B, block diagrams illustrating example, non-limiting embodiments of thecable1850 ofFIG. 18A used for inducing guided electromagnetic waves on power lines supported by utility poles. In one embodiment, as depicted inFIG. 20A, acable1850 can be coupled at one end to a microwave apparatus that launches guided electromagnetic waves within one or more inner layers ofcable1850 utilizing, for example, thehollow waveguide1808 shown inFIGS. 18A-18C. The microwave apparatus can utilize a microwave transceiver such as shown inFIG. 10A for transmitting or receiving signals fromcable1850. The guided electromagnetic waves induced in the one or more inner layers ofcable1850 can propagate to an exposed stub of thecable1850 located inside a horn antenna (shown as a dotted line inFIG. 20A) for radiating the electromagnetic waves via the horn antenna. The radiated signals from the horn antenna in turn can induce guided electromagnetic waves that propagate longitudinally on power line such as a medium voltage (MV) power line. In one embodiment, the microwave apparatus can receive AC power from a low voltage (e.g., 220V) power line. Alternatively, the horn antenna can be replaced with a stub antenna as shown inFIG. 20B to induce guided electromagnetic waves that propagate longitudinally on a power line such as the MV power line or to transmit wireless signals to other antenna system(s).
• In an alternative embodiment, the hollow horn antenna shown inFIG. 20A can be replaced with a solid dielectric antenna such as thedielectric antenna1901 ofFIG. 19A, or the pyramidal-shapedhorn antenna1901′ ofFIG. 19N. In this embodiment the horn antenna can radiate wireless signals directed to another horn antenna such as thebidirectional horn antennas2040 shown inFIG. 20C. In this embodiment, eachhorn antenna2040 can transmit wireless signals to anotherhorn antenna2040 or receive wireless signals from theother horn antenna2040 as shown inFIG. 20C. Such an arrangement can be used for performing bidirectional wireless communications between antennas. Although not shown, thehorn antennas2040 can be configured with an electromechanical device to steer a direction of thehorn antennas2040.
• In alternate embodiments, first andsecond cables1850A′ and1850B′ can be coupled to the microwave apparatus and to atransformer2052, respectively, as shown inFIGS. 20A and 20B. The first andsecond cables1850A′ and1850B′ can be represented by, for example,cable1820 orcable1830 ofFIGS. 18B and 18C, respectively, each having a conductive core. A first end of the conductive core of thefirst cable1850A′ can be coupled to the microwave apparatus for propagating guided electromagnetic waves launched therein. A second end of the conductive core of thefirst cable1850A′ can be coupled to a first end of a conductive coil of thetransformer2052 for receiving the guided electromagnetic waves propagating in thefirst cable1850A′ and for supplying signals associated therewith to a first end of asecond cable1850B′ by way of a second end of the conductive coil of thetransformer2052. A second end of thesecond cable1850B′ can be coupled to the horn antenna ofFIG. 20A or can be exposed as a stub antenna ofFIG. 20B for inducing guided electromagnetic waves that propagate longitudinally on the MV power line.
• In an embodiment wherecable1850,1850A′ and1850B′ each comprise multiple instances oftransmission mediums1800,1820, and/or1830, a poly-rod structure ofantennas1855 can be formed such as shown inFIG. 18K. Eachantenna1855 can be coupled, for example, to a horn antenna assembly as shown inFIG. 20A or a pie-pan antenna assembly (not shown) for radiating multiple wireless signals. Alternatively, theantennas1855 can be used as stub antennas inFIG. 20B. The microwave apparatus ofFIGS. 20A-20B can be configured to adjust the guided electromagnetic waves to beam steer the wireless signals emitted by theantennas1855. One or more of theantennas1855 can also be used for inducing guided electromagnetic waves on a power line.
• Turning now toFIG. 20C, a block diagram of an example, non-limiting embodiment of acommunication network2000 in accordance with various aspects described herein is shown. In one embodiment, for example, thewaveguide system1602 ofFIG. 16A can be incorporated into network interface devices (NIDs) such asNIDs2010 and2020 ofFIG. 20C. A NID having the functionality ofwaveguide system1602 can be used to enhance transmission capabilities between customer premises2002 (enterprise or residential) and a pedestal2004 (sometimes referred to as a service area interface or SAI).
• In one embodiment, acentral office2030 can supply one ormore fiber cables2026 to thepedestal2004. Thefiber cables2026 can provide high-speed full-duplex data services (e.g., 1-100 Gbps or higher) to mini-DSLAMs2024 located in thepedestal2004. The data services can be used for transport of voice, internet traffic, media content services (e.g., streaming video services, broadcast TV), and so on. In prior art systems, mini-DSLAMs2024 typically connect to twisted pair phone lines (e.g., twisted pairs included in category 5e or Cat. 5e unshielded twisted-pair (UTP) cables that include an unshielded bundle of twisted pair cables, such as 24 gauge insulated solid wires, surrounded by an outer insulating sheath), which in turn connect to thecustomer premises2002 directly. In such systems, DSL data rates taper off at 100 Mbps or less due in part to the length of legacy twisted pair cables to thecustomer premises2002 among other factors.
• The embodiments ofFIG. 20C, however, are distinct from prior art DSL systems. In the illustration ofFIG. 20C, a mini-DSLAM2024, for example, can be configured to connect toNID2020 via cable1850 (which can represent in whole or in part any of the cable embodiments described in relation toFIGS. 18A-18D and 18F-18L singly or in combination). Utilizingcable1850 betweencustomer premises2002 and apedestal2004, enablesNIDs2010 and2020 to transmit and receive guide electromagnetic waves for uplink and downlink communications. Based on embodiments previously described,cable1850 can be exposed to rain, or can be buried without adversely affecting electromagnetic wave propagation either in a downlink path or an uplink path so long as the electric field profile of such waves in either direction is confined at least in part or entirely within inner layers ofcable1850. In the present illustration, downlink communications represents a communication path from thepedestal2004 tocustomer premises2002, while uplink communications represents a communication path fromcustomer premises2002 to thepedestal2004. In an embodiment wherecable1850 comprises one of the embodiments ofFIGS. 18G-18H,cable1850 can also serve the purpose of supplying power to theNID2010 and2020 and other equipment of thecustomer premises2002 and thepedestal2004.
• Incustomer premises2002, DSL signals can originate from a DSL modem2006 (which may have a built-in router and which may provide wireless services such as WiFi to user equipment shown in the customer premises2002). The DSL signals can be supplied toNID2010 by atwisted pair phone2008. TheNID2010 can utilize theintegrated waveguide1602 to launch withincable1850 guidedelectromagnetic waves2014 directed to thepedestal2004 on an uplink path. In the downlink path, DSL signals generated by the mini-DSLAM2024 can flow through a twistedpair phone line2022 toNID2020. Thewaveguide system1602 integrated in theNID2020 can convert the DSL signals, or a portion thereof, from electrical signals to guidedelectromagnetic waves2014 that propagate withincable1850 on the downlink path. To provide full duplex communications, the guidedelectromagnetic waves2014 on the uplink can be configured to operate at a different carrier frequency and/or a different modulation approach than the guidedelectromagnetic waves2014 on the downlink to reduce or avoid interference. Additionally, on the uplink and downlink paths, the guidedelectromagnetic waves2014 are guided by a core section ofcable1850, as previously described, and such waves can be configured to have a field intensity profile that confines the guide electromagnetic waves in whole or in part in the inner layers ofcable1850. Although the guidedelectromagnetic waves2014 are shown outside ofcable1850, the depiction of these waves is for illustration purposes only. For this reason, the guidedelectromagnetic waves2014 are drawn with “hash marks” to indicate that they are guided by the inner layers ofcable1850.
• On the downlink path, theintegrated waveguide system1602 ofNID2010 receives the guidedelectromagnetic waves2014 generated byNID2020 and converts them back to DSL signals conforming to the requirements of theDSL modem2006. The DSL signals are then supplied to theDSL modem2006 via a set of twisted pair wires ofphone line2008 for processing. Similarly, on the uplink path, theintegrated waveguide system1602 ofNID2020 receives the guidedelectromagnetic waves2014 generated byNID2010 and converts them back to DSL signals conforming to the requirements of themini-DSLAM2024. The DSL signals are then supplied to the mini-DSLAM2024 via a set of twisted pair wires ofphone line2022 for processing. Because of the short length ofphone lines2008 and2022, theDSL modem2006 and the mini-DSLAM2024 can send and receive DSL signals between themselves on the uplink and downlink at very high speeds (e.g., 1 Gbps to 60 Gbps or more). Consequently, the uplink and downlink paths can in most circumstances exceed the data rate limits of traditional DSL communications over twisted pair phone lines.
• Typically, DSL devices are configured for asymmetric data rates because the downlink path usually supports a higher data rate than the uplink path. However,cable1850 can provide much higher speeds both on the downlink and uplink paths. With a firmware update, alegacy DSL modem2006 such as shown inFIG. 20C can be configured with higher speeds on both the uplink and downlink paths. Similar firmware updates can be made to the mini-DSLAM2024 to take advantage of the higher speeds on the uplink and downlink paths. Since the interfaces to theDSL modem2006 and mini-DSLAM2024 remain as traditional twisted pair phone lines, no hardware change is necessary for a legacy DSL modem or legacy mini-DSLAM other than firmware changes and the addition of theNIDs2010 and2020 to perform the conversion from DSL signals to guidedelectromagnetic waves2014 and vice-versa. The use of NIDs enables a reuse oflegacy modems2006 and mini-DSLAMs2024, which in turn can substantially reduce installation costs and system upgrades. For new construction, updated versions of mini-DSLAMs and DSL modems can be configured with integrated waveguide systems to perform the functions described above, thereby eliminating the need forNIDs2010 and2020 with integrated waveguide systems. In this embodiment, an updated version ofmodem2006 and updated version of mini-DSLAM2024 would connect directly tocable1850 and communicate via bidirectional guided electromagnetic wave transmissions, thereby averting a need for transmission or reception of DSL signals using twistedpair phone lines2008 and2022.
• In an embodiment where use ofcable1850 between thepedestal2004 andcustomer premises2002 is logistically impractical or costly,NID2010 can be configured instead to couple to acable1850′ (similar tocable1850 of the subject disclosure) that originates from awaveguide108 on autility pole118, and which may be buried in soil before it reachesNID2010 of thecustomer premises2002.Cable1850′ can be used to receive and transmit guidedelectromagnetic waves2014′ between theNID2010 and thewaveguide108.Waveguide108 can connect viawaveguide106, which can be coupled tobase station104.Base station104 can provide data communication services tocustomer premises2002 by way of its connection tocentral office2030 overfiber2026′. Similarly, in situations where access from thecentral office2030 topedestal2004 is not practical over a fiber link, but connectivity tobase station104 is possible viafiber link2026′, an alternate path can be used to connect toNID2020 of thepedestal2004 viacable1850″ (similar tocable1850 of the subject disclosure) originating frompole116.Cable1850″ can also be buried before it reachesNID2020.
• Turning now toFIGS. 20D-20F, block diagrams of example, non-limiting embodiments of antenna mounts that can be used in thecommunication network2000 ofFIG. 20C (or other suitable communication networks) in accordance with various aspects described herein are shown. In some embodiments, anantenna mount2053 can be coupled to a medium voltage power line by way of an inductive power supply that supplies energy to one or more waveguide systems (not shown) integrated in theantenna mount2053 as depicted inFIG. 20D. Theantenna mount2053 can include an array of dielectric antennas1901 (e.g., 16 antennas) such as shown by the top and side views depicted inFIG. 20F. Thedielectric antennas1901 shown inFIG. 20F can be small in dimension as illustrated by a picture comparison between groups ofdielectric antennas1901 and a conventional ballpoint pen. In other embodiments, a pole mountedantenna2054 can be used as depicted inFIG. 20D. In yet other embodiments, anantenna mount2056 can be attached to a pole with an arm assembly as shown inFIG. 20E. In other embodiments, anantenna mount2058, depicted inFIG. 20E, can be placed on a top portion of a pole coupled to acable1850 such as the cables as described in the subject disclosure.
• The array ofdielectric antennas1901 in any of the antenna mounts ofFIGS. 20D-20E can include one or more waveguide systems as described in the subject disclosure by way ofFIGS. 1-20. The waveguide systems can be configured to perform beam steering with the array of dielectric antennas1901 (for transmission or reception of wireless signals). Alternatively, eachdielectric antenna1901 can be utilized as a separate sector for receiving and transmitting wireless signals. In other embodiments, the one or more waveguide systems integrated in the antenna mounts ofFIGS. 20D-20E can be configured to utilize combinations of thedielectric antennas1901 in a wide range of multi-input multi-output (MIMO) transmission and reception techniques. The one or more waveguide systems integrated in the antenna mounts ofFIGS. 20D-20E can also be configured to apply communication techniques such as SISO, SIMO, MISO, SISO, signal diversity (e.g., frequency, time, space, polarization, or other forms of signal diversity techniques), and so on, with any combination of thedielectric antennas1901 in any of the antenna mounts ofFIGS. 20D-20E. In yet other embodiments, the antenna mounts ofFIGS. 20D-20E can be adapted with two or more stacks of the antenna arrays shown inFIG. 20F.
• FIGS. 21A and 21B describe embodiments for downlink and uplink communications.Method2100 ofFIG. 21A can begin withstep2102 where electrical signals (e.g., DSL signals) are generated by a DSLAM (e.g.,mini-DSLAM2024 ofpedestal2004 or from central office2030), which are converted to guidedelectromagnetic waves2014 atstep2104 byNID2020 and which propagate on a transmission medium such ascable1850 for providing downlink services to thecustomer premises2002. Atstep2108, theNID2010 of thecustomer premises2002 converts the guidedelectromagnetic waves2014 back to electrical signals (e.g., DSL signals) which are supplied atstep2110 to customer premises equipment (CPE) such asDSL modem2006 overphone line2008. Alternatively, or in combination, power and/or guidedelectromagnetic waves2014′ can be supplied from apower line1850′ of a utility grid (having an inner waveguide as illustrated inFIG. 18G or 18H) toNID2010 as an alternate or additional downlink (and/or uplink) path.
• Atstep2122 ofmethod2120 ofFIG. 21B, theDSL modem2006 can supply electrical signals (e.g., DSL signals) viaphone line2008 toNID2010, which in turn atstep2124, converts the DSL signals to guided electromagnetic waves directed toNID2020 by way ofcable1850. Atstep2128, theNID2020 of the pedestal2004 (or central office2030) converts the guidedelectromagnetic waves2014 back to electrical signals (e.g., DSL signals) which are supplied atstep2129 to a DSLAM (e.g., mini-DSLAM2024). Alternatively, or in combination, power and guidedelectromagnetic waves2014′ can be supplied from apower line1850′ of a utility grid (having an inner waveguide as illustrated inFIG. 18G or 18H) toNID2020 as an alternate or additional uplink (and/or downlink) path.
• Turning now toFIG. 21C, a flow diagram of an example, non-limiting embodiment of amethod2130 for inducing and receiving electromagnetic waves on a transmission medium is shown. Atstep2132, thewaveguides1865 and1865′ ofFIGS. 18N-18T can be configured to generate first electromagnetic waves from a first communication signal (supplied, for example, by a communication device such as a base station), and induce atstep2134 the first electromagnetic waves with “only” a fundamental wave mode at an interface of the transmission medium. In an embodiment, the interface can be an outer surface of the transmission medium as depicted inFIGS. 18Q and 18R. In another embodiment, the interface can be an inner layer of the transmission medium as depicted inFIGS. 18S and 18T. Atstep2136, thewaveguides1865 and1865′ ofFIGS. 18N-18T can be configured to receive second electromagnetic waves at an interface of a same or different transmission medium described inFIG. 21C. In an embodiment, the second electromagnetic waves can have “only” a fundamental wave mode. In other embodiments, the second electromagnetic waves may have a combination of wave modes such as a fundamental and non-fundamental wave modes. Atstep2138, a second communication signal can be generated from the second electromagnetic waves for processing by, for example, a same or different communication device. The embodiments ofFIGS. 21C and 21D can be applied to any embodiments described in the subject disclosure.
• Turning now toFIG. 21D, a flow diagram of an example, non-limiting embodiment of amethod2140 for inducing and receiving electromagnetic waves on a transmission medium is shown. Atstep2142, thewaveguides1865 and1865′ ofFIGS. 18N-18W can be configured to generate first electromagnetic waves from a first communication signal (supplied, for example, by a communication device), and induce atstep2144 second electromagnetic waves with “only” a non-fundamental wave mode at an interface of the transmission medium. In an embodiment, the interface can be an outer surface of the transmission medium as depicted inFIGS. 18Q and 18R. In another embodiment, the interface can be an inner layer of the transmission medium as depicted inFIGS. 18S and 18T. Atstep2146, thewaveguides1865 and1865′ ofFIGS. 18N-18W can be configured to receive electromagnetic waves at an interface of a same or different transmission medium described inFIG. 21E. In an embodiment, the electromagnetic waves can have “only” a non-fundamental wave mode. In other embodiments, the electromagnetic waves may have a combination of wave modes such as a fundamental and non-fundamental wave modes. Atstep2148, a second communication signal can be generated from the electromagnetic waves for processing by, for example, a same or different communication device. The embodiments ofFIGS. 21E and 21F can be applied to any embodiments described in the subject disclosure.
• FIG. 21E illustrates a flow diagram of an example, non-limiting embodiment of amethod2150 for radiating signals from a dielectric antenna such as those shown inFIGS. 19A and 19N.Method2150 can begin withstep2152 where a transmitter such aswaveguide system1865′ ofFIG. 18T generates first electromagnetic waves including a first communication signal. The first electromagnetic waves in turn induce atstep2153 second electromagnetic waves on acore1852 of acable1850 coupled to a feed point of any of the dielectric antenna described in the subject disclosure. The second electromagnetic waves are received at the feed point atstep2154 and propagate atstep2155 to a proximal portion of the dielectric antenna. Atstep2156, the second electromagnetic waves continue to propagate from the proximal portion of the dielectric antenna to an aperture of the antenna and thereby cause atstep2157 wireless signals to be radiated as previously described in relation toFIGS. 19A-19N.
• FIG. 21F illustrates a flow diagram of an example, non-limiting embodiment of amethod2160 for receiving wireless signals at a dielectric antenna such as the dielectric antennas ofFIG. 19A or 19N.Method2160 can begin withstep2161 where the aperture of the dielectric antenna receives wireless signals. Atstep2162, the wireless signals induce electromagnetic waves that propagate from the aperture to the feed point of the dielectric antenna. The electromagnetic waves once received at the feed point atstep2163, propagate atstep2164 to the core of the cable coupled to the feed point. Atstep2165, a receiver such as thewaveguide system1865′ ofFIG. 18T receives the electromagnetic waves and generates therefrom at step2166 a second communication signal.
• Methods2150 and2160 can be used to adapt the dielectric antennas ofFIGS. 19A, 19C, 19E, 19G-19I, and 19L-19O for bidirectional wireless communications with other dielectric antennas such as thedielectric antennas2040 shown inFIG. 20C, and/or for performing bidirectional wireless communications with other communication devices such as a portable communication devices (e.g., cell phones, tablets, laptops), wireless communication devices situated in a building (e.g., a residence), and so on. A microwave apparatus such as shown inFIG. 20A can be configured with one ormore cables1850 that couple to a plurality ofdielectric antennas2040 as shown inFIG. 20C. In some embodiments, thedielectric antennas2040 shown inFIG. 20C can be configured with yet more dielectric antennas (e.g.,19C,19E,19G-19I, and19L-19O) to further expand the region of wireless communications by such antennas.
• Methods2150 and2160 can be further adapted for use with the phasedarray1976 ofdielectric antennas1901 ofFIG. 19O by applying incremental phase delays to portions of the antennas to steer far-field wireless signals emitted.Methods2150 and2160 can also be adapted for adjusting the far-field wireless signals generated by thedielectric antenna1901 and/or an orientation of thedielectric antenna1901 utilizing the gimbal depicted inFIG. 19M (which may have controllable actuators) to improve reception of the far-field wireless signals by a remote system (such as anotherdielectric antenna1901 coupled to a waveguide system). Additionally, themethods2150 and2160 can be adapted to receive instructions, messages or wireless signals from the remote system to enable the waveguide system receiving such signals by way of itsdielectric antenna1901 to perform adjustments of the far-field signals.
• While for purposes of simplicity of explanation, the respective processes are shown and described as a series of blocks inFIGS. 21A-21F, it is to be understood and appreciated that the claimed subject matter is not limited by the order of the blocks, as some blocks may occur in different orders and/or concurrently with other blocks from what is depicted and described herein. Moreover, not all illustrated blocks may be required to implement the methods described herein.
• FIG. 21G illustrates a flow diagram of an example, non-limiting embodiment of amethod2170 for detecting and mitigating disturbances occurring in a communication network, such as, for example, the system ofFIGS. 16A and 16B.Method2170 can begin withstep2172 where a network element, such as thewaveguide system1602 ofFIGS. 16A-16B, can be configured to monitor degradation of guided electromagnetic waves on an outer surface of a transmission medium, such aspower line1610. A signal degradation can be detected according to any number of factors including without limitation, a signal magnitude of the guided electromagnetic waves dropping below a certain magnitude threshold, a signal to noise ratio (SNR) dropping below a certain SNR threshold, a Quality of Service (QoS) dropping below one or more thresholds, a bit error rate (BER) exceeding a certain BER threshold, a packet loss rate (PLR) exceeding a certain PLR threshold, a ratio of reflected electromagnetic waves to forward electromagnetic waves exceeding a certain threshold, an unexpected change or alteration to a wave mode, a spectral change in the guided electromagnetic waves indicating an object or objects are causing a propagation loss or scattering of the guided electromagnetic waves (e.g., water accumulation on an outer surface of the transmission medium, a splice in the transmission medium, a broken tree limb, etc.), or any combinations thereof. A sensing device such as, the disturbance sensor1604bofFIG. 16A, can be adapted to perform one or more of the above signal measurements and determine thereby whether the electromagnetic waves are experiencing signal degradation. Other sensing devices suitable for performing the above measurements are contemplated by the subject disclosure.
• If signal degradation is detected atstep2174, the network element can proceed to step2176 where it can determine which object or objects may be causing the degradation, and once detected, report the detected object(s) to thenetwork management system1601 ofFIGS. 16A-16B. Object detection can be accomplished by spectral analysis or other forms of signal analysis, environmental analysis (e.g., barometric readings, rain detection, etc.), or other suitable techniques for detecting foreign objects that may adversely affect propagation of electromagnetic waves guided by the transmission medium. For example, the network element can be configured to generate spectral data derived from an electromagnetic wave received by the network element. The network element can then compare the spectral data to a plurality of spectral profiles stored in its memory. The plurality of spectral profiles can be pre-stored in a memory of the network element, and can be used to characterize or identify obstructions that may cause a propagation loss or signal degradation when such obstructions are present on an outer surface of the transmission medium.
• For example, an accumulation of water on an outer surface of a transmission medium, such as a thin layer of water and/or water droplets, may cause a signal degradation in electromagnetic waves guided by the transmission medium that may be identifiable by a spectral profile comprising spectral data that models such an obstruction. The spectral profile can be generated in a controlled environment (such as a laboratory or other suitable testing environment) by collecting and analyzing spectral data generated by test equipment (e.g., a waveguide system with spectrum analysis capabilities) when receiving electromagnetic waves over an outer surface of a transmission medium that has been subjected to water (e.g., simulated rain water). An obstruction such as water can generate a different spectral signature than other obstructions (e.g., a splice between transmission mediums). A unique spectral signature can be used to identify certain obstructions over others. With this technique, spectral profiles can be generated for characterizing other obstructions such as a fallen tree limb on the transmission medium, a splice, and so on. In addition to spectral profiles, thresholds can be generated for different metrics such as SNR, BER, PLR, and so on. These thresholds can be chosen by a service provider according to desired performance measures for a communication network that utilizing guided electromagnetic waves for transport of data. Some obstructions may also be detected by other methods. For example, rain water may be detected by a rain detector coupled to a network element, fallen tree limbs may be detected by a vibration detector coupled to the network element, and so on.
• If a network element does not have access to equipment to detect objects that may be causing a degradation of electromagnetic waves, then the network element can skipstep2176 and proceed to step2178 where it notifies one or more neighboring network elements (e.g., other waveguide system(s)1602 in a vicinity of the network element) of the detected signal degradation. If signal degradation is significant, the network element can resort to a different medium for communicating with neighboring network element(s), such as, for example, wireless communications. Alternatively, the network element can substantially reduce the operating frequency of the guided electromagnetic waves (e.g., from 40 GHz to 1 GHz), or communicate with neighboring network elements utilizing other guided electromagnetic waves operating at a low frequency, such as a control channel (e.g., 1 MHz). A low frequency control channel may be much less susceptible to interference by the object(s) causing the signal degradation at much higher operating frequencies.
• Once an alternate means of communication is established between network elements, atstep2180 the network element and neighboring network elements can coordinate a process to adjust the guided electromagnetic waves to mitigate the detected signal degradation. The process can include, for example, a protocol for choosing which of the network elements will perform the adjustments to the electromagnetic waves, the frequency and magnitude of adjustments, and goals to achieve a desired signal quality (e.g., QoS, BER, PLR, SNR, etc.). If, for example, the object causing the signal degradation is water accumulation on the outer surface of the transmission medium, the network elements can be configured to adjust a polarization of the electrical fields (e-fields) and/or magnetic fields (h-fields) of the electromagnetic waves to attain a radial alignment of the e-fields as shown inFIG. 21H. In particular,FIG. 21H presents a block diagram2101 illustrating an example, non-limiting embodiment of an alignment of e-fields of an electromagnetic wave to mitigate propagation losses due to water accumulation on a transmission medium in accordance with various aspects described herein. In this example, the longitudinal section of a cable, such as an insulated metal cable implementation oftransmission medium125, is presented along with field vectors that illustrate the e-fields associated with guided electromagnetic waves that propagate at 40 GHz. Stronger e-fields are presented by darker field vectors relative to weaker e-fields.
• In one embodiment, an adjustment in polarization can be accomplished by generating a specific wave mode of the electromagnetic waves (e.g., transverse magnetic (TM) mode, transverse electric (TE) mode, transverse electromagnetic (TEM) mode, or a hybrid of a TM mode and TE mode also known as an HE mode). Assuming, for example, that the network element comprises thewaveguide system1865′ ofFIG. 18W, an adjustment in a polarization of e-fields can be accomplished by configuring two ormore MMICs1870 to alter a phase, frequency, amplitude or combinations thereof of the electromagnetic waves generated by eachMMIC1870. Certain adjustments may cause, for example, the e-fields in the region of the water film shown inFIG. 21H to align perpendicularly to the surface of the water. Electric fields that are perpendicular (or approximately perpendicular) to the surface of water will induce weaker currents in the water film than e-fields parallel to the water film. By inducing weaker currents, the electromagnetic waves propagating longitudinally will experience less propagation loss. Additionally, it is also desirable for the concentration of the e-fields to extend above the water film into the air. If the concentration of e-fields in the air remains high and the majority of the total field strength is in the air instead of being concentrated in the region of the water and the insulator, then propagation losses will also be reduced. For example, e-fields of electromagnetic waves that are tightly bound to an insulation layer such as, Goubau waves (or TM00 waves—see block diagram2131 ofFIG. 21K), will experience higher propagation losses even though the e-fields may be perpendicular (or radially aligned) to the water film because more of the field strength is concentrated in the region of the water.
• Accordingly, electromagnetic waves with e-fields perpendicular (or approximately perpendicular) to a water film having a higher proportion of the field strength in a region of air (i.e., above the water film) will experience less propagation loss than tightly bound electromagnetic waves having more field strength in the insulating or water layers or electromagnetic waves having e-fields in the direction of propagation within the region of the water film that generate greater losses.
• FIG. 21H depicts, in a longitudinal view of an insulated conductor, e-field for TM01 electromagnetic waves operating at 40 GHz.FIGS. 21I and 21J, in contrast, depictcross-sectional views2111 and2121, respectively, of the insulated conductor ofFIG. 21H illustrating the field strength of e-fields in the direction of propagation of the electromagnetic waves (i.e., e-fields directed out of the page ofFIGS. 21I and 21J). The electromagnetic waves shown inFIGS. 21I and 21J have a TM01 wave mode at 45 GHz and 40 GHz, respectively.FIG. 21I shows that the intensity of the e-fields in the direction of propagation of the electromagnetic waves is high in a region between the outer surface of the insulation and the outer surface of the water film (i.e., the region of the water film). The high intensity is depicted by a light color (the lighter the color the higher the intensity of the e-fields directed out of the page).FIG. 21I illustrates that there is a high concentration of e-fields polarized longitudinally in the region of the water film, which causes high currents in the water film and consequently high propagation losses. Thus, under certain circumstances, electromagnetic waves at 45 GHz (having a TM01 wave mode) are less suitable to mitigate rain water or other obstructions located on the outer surface of the insulated conductor.
• In contrast,FIG. 21J shows that the intensity of the e-fields in the direction of propagation of the electromagnetic waves is weaker in the region of the water film. The lower intensity is depicted by the darker color in the region of the water film. The lower intensity is a result of the e-fields being polarized mostly perpendicular or radial to the water film. The radially aligned e-fields also are highly concentrated in the region of air as shown inFIG. 21H. Thus, electromagnetic waves at 40 GHz (having a TM01 wave mode) produce e-fields that induce less current in the water film than 45 GHz waves with the same wave mode. Accordingly, the electromagnetic waves ofFIG. 21J exhibit properties more suitable for reducing propagation losses due to a water film or droplets accumulating on an outer surface of an insulated conductor.
• Since the physical characteristics of a transmission medium can vary, and the effects of water or other obstructions on the outer surface of the transmission medium may cause non-linear effects, it may not always be possible to precisely model all circumstances so as to achieve the e-field polarization and e-field concentration in air depicted inFIG. 21H on a first iteration ofstep2182. To increase a speed of the mitigation process, a network element can be configured to choose from a look-up table at step2186 a starting point for adjusting electromagnetic waves. In one embodiment, entries of the look-up table can be searched for matches to a type of object detected at step2176 (e.g., rain water). In another embodiment, the look-up table can be searched for matches to spectral data derived from the affected electromagnetic wave received by the network elements. Table entries can provide specific parameters for adjusting electromagnetic waves (e.g., frequency, phase, amplitude, wave mode, etc.) to achieve at least a coarse adjustment that achieves similar e-field properties as shown inFIG. 21H. A coarse adjustment can serve to improve the likelihood of converging on a solution that achieves the desirable propagation properties previously discussed in relation toFIGS. 21H and 21J.
• Once a coarse adjustment is made atstep2186, the network element can determine atstep2184 whether the adjustment has improved signal quality to a desirable target.Step2184 can be implemented by a cooperative exchange between network elements. For example, suppose the network element atstep2186 generates an adjusted electromagnetic wave according to parameters obtained from the look-up table and transmits the adjusted electromagnetic wave to a neighboring network element. Atstep2184 the network element can determine whether the adjustment has improved signal quality by receiving feedback from a neighboring network element receiving the adjusted electromagnetic waves, analyzing the quality of the received waves according to agreed target goals, and providing the results to the network element. Similarly, the network element can test adjusted electromagnetic waves received from neighboring network elements and can provide feedback to the neighboring network elements including the results of the analysis. While a particular search algorithm is discussed above, other search algorithms such as a gradient search, genetic algorithm, global search or other optimization techniques can likewise be employed. Accordingly, steps2182,2186 and2184 represent an adjustment and testing process performed by the network element and its neighbor(s).
• With this in mind, if at step2184 a network element (or its neighbors) determine that signal quality has not achieved one or more desired parametric targets (e.g., SNR, BER, PLR, etc.), then incremental adjustments can begin atstep2182 for each of the network element and its neighbors. Atstep2182, the network element (and/or its neighbors) can be configured to adjust a magnitude, phase, frequency, wave mode and/or other tunable features of the electromagnetic waves incrementally until a target goal is achieved. To perform these adjustments, a network element (and its neighbors) can be configured with thewaveguide system1865′ ofFIG. 18W. The network element (and its neighbors) can utilize two ormore MMICs1870 to incrementally adjust one or more operational parameters of the electromagnetic waves to achieve e-fields polarized in a particular direction (e.g., away from the direction of propagation in the region of the water film). The two or more MMICs1870 can also be configured to incrementally adjust one or more operational parameters of the electromagnetic waves that achieve e-fields having a high concentration in a region of air (outside the obstruction).
• The iteration process can be a trial-and-error process coordinated between network elements to reduce a time for converging on a solution that improves upstream and downstream communications. As part of the coordination process, for example, one network element can be configured to adjust a magnitude but not a wave mode of the electromagnetic waves, while another network element can be configured to adjust the wave mode and not the magnitude. The number of iterations and combination of adjustments to achieve desirable properties in the electromagnetic waves to mitigate obstructions on an outer surface of a transmission medium can be established by a service provider according to experimentation and/or simulations and programmed into the network elements.
• Once the network element(s) detect atstep2184 that signal quality of upstream and downstream electromagnetic waves has improved to a desirable level that achieves one or more parametric targets (e.g. SNR, BER, PLR, etc.), the network elements can proceed to step2188 and resume communications according to the adjusted upstream and downstream electromagnetic waves. While communications take place atstep2188, the network elements can be configured to transmit upstream and downstream test signals based on the original electromagnetic waves to determine if the signal quality of such waves has improved. These test signals can be transmitted at periodic intervals (e.g., once every 30 seconds or other suitable periods). Each network element can, for example, analyze spectral data of the received test signals to determine if they achieve a desirable spectral profile and/or other parametric target (e.g. SNR, BER, PLR, etc.). If the signal quality has not improved or has improved nominally, the network elements can be configured to continue communications atstep2188 utilizing the adjusted upstream and downstream electromagnetic waves.
• If, however, signal quality has improved enough to revert back to utilizing the original electromagnetic waves, then the network element(s) can proceed to step2192 to restore settings (e.g., original wave mode, original magnitude, original frequency, original phase, original spatial orientation, etc.) that produce the original electromagnetic waves. Signal quality may improve as a result of a removal of the obstruction (e.g., rain water evaporates, field personnel remove a fallen tree limb, etc.). Atstep2194, the network elements can initiate communications utilizing the original electromagnetic waves and perform upstream and downstream tests. If the network elements determine atstep2196 from tests performed atstep2194 that signal quality of the original electromagnetic waves is satisfactory, then the network elements can resume communications with the original electromagnetic waves and proceed to step2172 and subsequent steps as previously described.
• A successful test can be determined atstep2196 by analyzing test signals according to parametric targets associated with the original electromagnetic waves (e.g., BER, SNR, PLR, etc.). If the tests performed atstep2194 are determined to be unsuccessful atstep2196, the network element(s) can proceed tosteps2182,2186 and2184 as previously described. Since a prior adjustment to the upstream and downstream electromagnetic waves may have already been determined successfully, the network element(s) can restore the settings used for the previously adjusted electromagnetic waves. Accordingly, a single iteration of any one ofsteps2182,2186 and2184 may be sufficient to return tostep2188.
• It should be noted that in some embodiments restoring the original electromagnetic waves may be desirable if, for example, data throughput when using the original electromagnetic waves is better than data throughput when using the adjusted electromagnetic waves. However, when data throughput of the adjusted electromagnetic waves is better or substantially close to the data throughput of the original electromagnetic waves, the network element(s) may instead be configured to continue fromstep2188.
• It is also noted that althoughFIGS. 21H and 21K describe a TM01 wave mode, other wave modes (e.g., HE waves, TE waves, TEM waves, etc.) or combination of wave modes may achieve the desired effects shown inFIG. 21H. Accordingly, a wave mode singly or in combination with one or more other wave modes may generate electromagnetic waves with e-field properties that reduce propagation losses as described in relation toFIGS. 21H and 21J. Such wave modes are therefore contemplated as possible wave modes the network elements can be configured to produce.
• It is further noted thatmethod2170 can be adapted to generate atsteps2182 or2186 other wave modes that may not be subject to a cutoff frequency. For example,FIG. 21L depicts a block diagram2141 of an example, non-limiting embodiment of electric fields of a hybrid wave in accordance with various aspects described herein. Waves having an HE mode have linearly polarized e-fields which point away from a direction of propagation of electromagnetic waves and can be perpendicular (or approximately perpendicular) to a region of obstruction (e.g., water film shown inFIGS. 21H-21J). Waves with an HE mode can be configured to generate e-fields that extend substantially outside of an outer surface of an insulated conductor so that more of the total accumulated field strength is in air. Accordingly, some electromagnetic waves having an HE mode can exhibit properties of a large wave mode with e-fields orthogonal or approximately orthogonal to a region of obstruction. As described earlier, such properties can reduce propagation losses. Electromagnetic waves having an HE mode also have the unique property that they do not have a cutoff frequency (i.e., they can operate near DC) unlike other wave modes which have non-zero cutoff frequencies.
• Turning now toFIG. 21M, a block diagram2151 illustrating an example, non-limiting embodiment of electric field characteristics of a hybrid wave versus a Goubau wave in accordance with various aspects described herein is shown. Diagram2158 shows a distribution of energy between HE11 mode waves and Goubau waves for an insulated conductor. The energy plots of diagram2158 assume that the amount of power used to generate the Goubau waves is the same as the HE11 waves (i.e., the area under the energy curves is the same). In the illustration of diagram2158, Goubau waves have a steep drop in power when Goubau waves extend beyond the outer surface of an insulated conductor, while HE11 waves have a substantially lower drop in power beyond the insulation layer. Consequently, Goubau waves have a higher concentration of energy near the insulation layer than HE 11 waves. Diagram2167 depicts similar Goubau and HE11 energy curves when a water film is present on the outer surface of the insulator. The difference between the energy curves of diagrams2158 and2167 is that the drop in power for the Goubau and the HE11 energy curves begins on an outer edge of the insulator for diagram2158 and on an outer edge of the water film for diagram2167. The energy curves diagrams2158 and2167, however, depict the same behavior. That is, the electric fields of Goubau waves are tightly bound to the insulation layer, which when exposed to water results in greater propagation losses than electric fields of HE11 waves having a higher concentration outside the insulation layer and the water film. These properties are depicted in the HE11 and Goubau diagrams2168 and2159, respectively.
• By adjusting an operating frequency of HE11 waves, e-fields of HE11 waves can be configured to extend substantially above a thin water film as shown in block diagram2169 ofFIG. 21N having a greater accumulated field strength in areas in the air when compared to fields in the insulator and a water layer surrounding the outside of the insulator.FIG. 21N depicts a wire having a radius of 1 cm and an insulation radius of 1.5 cm with a dielectric constant of 2.25. As the operating frequency of HE11 waves is reduced, the e-fields extend outwardly expanding the size of the wave mode. At certain operating frequencies (e.g., 3 GHz) the wave mode expansion can be substantially greater than the diameter of the insulated wire and any obstructions that may be present on the insulated wire.
• By having e-fields that are perpendicular to a water film and by placing most of its energy outside the water film, HE11 waves have less propagation loss than Goubau waves when a transmission medium is subjected to water or other obstructions. Although Goubau waves have radial e-fields which are desirable, the waves are tightly coupled to the insulation layer, which results in the e-fields being highly concentrated in the region of an obstruction. Consequently, Goubau waves are still subject to high propagation losses when an obstruction such as a water film is present on the outer surface of an insulated conductor.
• Turning now toFIGS. 22A and 22B, block diagrams illustrating example, non-limiting embodiments of awaveguide system2200 for launching hybrid waves in accordance with various aspects described herein is shown. Thewaveguide system2200 can compriseprobes2202 coupled to a slideable orrotatable mechanism2204 that enables theprobes2202 to be placed at different positions or orientations relative to an outer surface of aninsulated conductor2208. Themechanism2204 can comprise acoaxial feed2206 or other coupling that enables transmission of electromagnetic waves by theprobes2202. Thecoaxial feed2206 can be placed at a position on themechanism2204 so that the path difference between theprobes2202 is one-half a wavelength or some odd integer multiple thereof. When theprobes2202 generate electromagnetic signals of opposite phase, electromagnetic waves can be induced on the outer surface of theinsulated conductor2208 having a hybrid mode (such as an HE11 mode).
• Themechanism2204 can also be coupled to a motor or other actuator (not shown) for moving theprobes2202 to a desirable position. In one embodiment, for example, thewaveguide system2200 can comprise a controller that directs the motor to rotate the probes2202 (assuming they are rotatable) to a different position (e.g., east and west) to generate electromagnetic waves that have a horizontally polarized HE11 mode as shown in a block diagram2300 ofFIG. 23. To guide the electromagnetic waves onto the outer surface of theinsulated conductor2208, thewaveguide system2200 can further comprise a taperedhorn2210 shown inFIG. 22B. The taperedhorn2210 can be coaxially aligned with theinsulated conductor2208. To reduce the cross-sectional dimension of the taperedhorn2210, an additional insulation layer (not shown) can placed on theinsulated conductor2208. The additional insulation layer can be similar to the taperedinsulation layer1879 shown inFIGS. 18Q and 18R. The additional insulation layer can have a tapered end that points away from the taperedhorn2210. The taperedinsulation layer1879 can reduce a size of an initial electromagnetic wave launched according to an HE11 mode. As the electromagnetic waves propagate towards the tapered end of the insulation layer, the HE11 mode expands until it reaches its full size as shown inFIG. 23. In other embodiments, thewaveguide system2200 may not need to use the taperedinsulation layer1879.
• FIG. 23 illustrates that HE11 mode waves can be used to mitigate obstructions such as rain water. For example, suppose that rain water has caused a water film to surround an outer surface of theinsulated conductor2208 as shown inFIG. 23. Further assume that water droplets have collected at the bottom of theinsulated conductor2208. As illustrated inFIG. 23, the water film occupies a small fraction of the total HE11 wave. Also, by having horizontally polarized HE11 waves, the water droplets are in a least-intense area of the HE11 waves reducing losses caused by the droplets. Consequently, the HE11 waves experience much lower propagation losses than Goubau waves or waves having a mode that is tightly coupled to theinsulated conductor2208 and thus greater energy in the areas occupied by the water.
• It is submitted that thewaveguide system2200 ofFIGS. 22A-22B can be replaced with other waveguide systems of the subject disclosure capable of generating electromagnetic waves having an HE mode. For example, thewaveguide system1865′ ofFIG. 18W can be configured to generate electromagnetic waves having an HE mode. In an embodiment, two or more MMICs1870 of thewaveguide system1865′ can be configured to generate electromagnetic waves of opposite phase to generate polarized e-fields such as those present in an HE mode. In another embodiment, different pairs of MMICs1870 can be selected to generate HE waves that are polarized at different spatial positions (e.g., north and south, west and east, northwest and southeast, northeast and southeast, or other sub-fractional coordinates). Additionally, the waveguide systems ofFIGS. 18N-18W can be configured to launch electromagnetic waves having an HE mode onto thecore1852 of one or more embodiments ofcable1850 suitable for propagating HE mode waves.
• Although HE waves can have desirable characteristics for mitigating obstructions on a transmission medium, it is submitted that certain wave modes having a cutoff frequency (e.g., TE modes, TM modes, TEM modes or combinations thereof) may also exhibit waves that are sufficiently large and have polarized e-fields that are orthogonal (or approximately orthogonal) to a region of an obstruction enabling their use for mitigating propagation losses caused by the obstruction. Method2070 can be adapted, for example, to generate such wave modes from a look-up table at step2086. Wave modes having a cutoff frequency that exhibit, for example, a wave mode larger than the obstruction and polarized e-fields perpendicular (or approximately perpendicular) to the obstruction can be determined by experimentation and/or simulation. Once a combination of parameters (e.g., magnitude, phase, frequency, wave mode(s), spatial positioning, etc.) for generating one or more waves with cutoff frequencies having low propagation loss properties is determined, the parametric results for each wave can be stored in a look-up table in a memory of a waveguide system. Similarly, wave modes with cutoff frequencies exhibiting properties that reduce propagation losses can also be generated iteratively by any of the search algorithms previously described in the process of steps2082-2084.
• While for purposes of simplicity of explanation, the respective processes are shown and described as a series of blocks inFIG. 21G, it is to be understood and appreciated that the claimed subject matter is not limited by the order of the blocks, as some blocks may occur in different orders and/or concurrently with other blocks from what is depicted and described herein. Moreover, not all illustrated blocks may be required to implement the methods described herein.
• FIG. 24 illustrates a flow diagram of an example, non-limiting embodiment of amethod2400 for sending and receiving electromagnetic waves.Method2400 can be adapted for thewaveguides2522 shown inFIGS. 25A through 25C.Method2400 can begin atstep2402 where a generator generates a first electromagnetic wave. At step2404 a waveguide guides the first electromagnetic wave to an interface of a transmission medium, which in turn induces at step2406 a second electromagnetic wave at the interface of the transmission medium. Steps2402-2406 can be applied to thewaveguides2522 ofFIGS. 25A, 25B and 25C. The generator can be anMMIC1870 orslot1863 as shown inFIGS. 18N through 18W. For illustration purposes only, the generator is assumed to be anMMIC2524 positioned within thewaveguide2522 as shown inFIGS. 25A through 25C. AlthoughFIGS. 25A through 25C illustrate in a longitudinal view ofcylindrical waveguides2522, thewaveguides2522 can be adapted to other structural shapes (e.g., square, rectangular, etc.).
• Turning to the illustration ofFIG. 25A, thewaveguide2522 covers afirst region2506 of acore2528. Within thefirst region2506,waveguide2522 has anouter surface2522A and aninner surface2523. Theinner surface2523 of thewaveguide2522 can be constructed from a metallic material, carbon, or other material that reflects electromagnetic waves and thereby enables thewaveguide2522 to be configured at step2404 to guide the firstelectromagnetic wave2502 towards thecore2528. Thecore2528 can comprise a dielectric core (as described in the subject disclosure) that extends to theinner surface2523 of thewaveguide2522. In other embodiments, the dielectric core can be surrounded by cladding (such as shown inFIG. 18A), whereby the cladding extends to theinner surface2523 of thewaveguide2522. In yet other embodiments, thecore2528 can comprise an insulated conductor, where the insulation extends to theinner surface2523 of thewaveguide2522. In this embodiment, the insulated conductor can be a power line, a coaxial cable, or other types of insulated conductors.
• In thefirst region2506, thecore2528 comprises aninterface2526 for receiving the firstelectromagnetic wave2502. In one embodiment, theinterface2526 of thecore2528 can be configured to reduce reflections of the firstelectromagnetic wave2502. In one embodiment, theinterface2526 can be a tapered structure to reduce reflections of the firstelectromagnetic wave2502 from a surface of thecore2528. Other structures can be used for theinterface2526. For example, theinterface2526 can be partially tapered with a rounded point. Accordingly, any structure, configuration, or adaptation of theinterface2526 that can reduced reflections of the firstelectromagnetic wave2502 is contemplated by the subject disclosure. Atstep2406, the firstelectromagnetic wave2502 induces (or otherwise generates) a secondelectromagnetic wave2504 that propagates within thecore2528 in thefirst region2506 covered by thewaveguide2522. Theinner surface2523 of thewaveguide2522 confines the secondelectromagnetic wave2504 within thecore2528.
• Asecond region2508 of thecore2528 is not covered by thewaveguide2522, and is thereby exposed to the environment (e.g., air). In thesecond region2508, the secondelectromagnetic wave2504 expands outwardly beginning from the discontinuity between the edge of thewaveguide2522 and the exposedcore2528. To reduce the radiation into the environment from the secondelectromagnetic wave2504, thecore2528 can be configured to have a taperedstructure2520. As the secondelectromagnetic wave2504 propagates along the taperedstructure2520, the secondelectromagnetic wave2504 remains substantially bound to the taperedstructure2520 thereby reducing radiation losses. The taperedstructure2520 ends at a transition from thesecond region2508 to athird region2510. In the third region, the core has acylindrical structure2529 having a diameter equal to the endpoint of the taperedstructure2520 at the juncture between thesecond region2508 and thethird region2510. In thethird region2510 of thecore2528, the secondelectromagnetic wave2504 experiences a low propagation loss. In one embodiment, this can be accomplished by selecting a diameter of thecore2528 that enables the secondelectromagnetic wave2504 to be loosely bound to the outer surface of thecore2528 in thethird region2510. Alternatively, or in combination, propagation losses of the secondelectromagnetic wave2504 can be reduced by configuring theMMICs2524 to adjust a wave mode, wave length, operating frequency, or other operational parameter of the firstelectromagnetic wave2502.
• FIG. 25D illustrates a portion of thewaveguide2522 ofFIG. 25A depicted as a cylindrical ring (that does not show theMMICs2524 or the taperedstructure2526 ofFIG. 25A). In the simulations, a first electromagnetic wave is injected at the endpoint of thecore2528 shown inFIG. 25D. The simulation assumes no reflections of the first electromagnetic wave based on an assumption that a tapered structure2526 (or other suitable structure) is used to reduce such reflections. The simulations are shown as two longitudinal cross-sectional views of thecore2528 covered in part bywaveguide section2523A, and an orthogonal cross-sectional view of thecore2528. In the case of the longitudinal cross-sectional views, one of the illustrations is a blown up view of a portion of the first illustration.
• As can be seen from the simulations,electromagnetic wave fields2532 of the secondelectromagnetic wave2504 are confined within thecore2528 by theinner surface2523 of thewaveguide section2523A. As the secondelectromagnetic wave2504 enters the second region2508 (no longer covered by thewaveguide section2523A), the taperedstructure2520 reduces radiation losses of theelectromagnetic wave fields2532 as it expands over the outer tapered surface of thecore2528. As the secondelectromagnetic wave2504 enters thethird region2510, theelectromagnetic wave fields2532 stabilize and thereafter remain loosely coupled to the core2528 (depicted in the longitudinal and orthogonal cross-sectional views), which reduces propagation losses.
• FIG. 25B provides an alternative embodiment to the taperedstructure2520 in thesecond region2508. The taperedstructure2520 can be avoided by extending thewaveguide2522 into thesecond region2508 with atapered structure2522B and maintaining the diameter of thecore2528 throughout the first, second andthird regions2506,2508 and2510 of thecore2528 as depicted inFIG. 25B. Thehorn structure2522B can be used to reduce radiation losses of the secondelectromagnetic wave2504 as the secondelectromagnetic wave2504 transitions from thefirst region2506 to thesecond region2508. In thethird region2510, thecore2528 is exposed to the environment. As noted earlier, thecore2528 is configured in thethird region2510 to reduce propagation losses by the secondelectromagnetic wave2504. In one embodiment, this can be accomplished by selecting a diameter of thecore2528 that enables the secondelectromagnetic wave2504 to be loosely bound to the outer surface of thecore2528 in thethird region2510. Alternatively, or in combination, propagation losses of the secondelectromagnetic wave2504 can be reduced by adjusting a wave mode, wave length, operating frequency, or other performance parameter of the firstelectromagnetic wave2502.
• Thewaveguides2522 ofFIGS. 25A and 25B can also be adapted for receiving electromagnetic waves. For example, thewaveguide2522 ofFIG. 25A can be adapted to receive an electromagnetic wave atstep2412. This can be represented by anelectromagnetic wave2504 propagating in thethird region2510 from east to west (orientation shown at bottom right ofFIGS. 25A-25B) towards thesecond region2508. Upon reaching thesecond region2508, theelectromagnetic wave2504 gradually becomes more tightly coupled to the taperedstructure2520. When it reaches the boundary between thesecond region2508 and the first region2506 (i.e., the edge of the waveguide2522), theelectromagnetic wave2504 propagates within thecore2528 confined by theinner surface2523 of thewaveguide2522. Eventually theelectromagnetic wave2504 reaches an endpoint of the taperedinterface2526 of thecore2528 and radiates as a newelectromagnetic wave2502 which is guided by theinner surface2523 of thewaveguide2522.
• One or more antennas of theMMICs2524 can be configured to receive theelectromagnetic wave2502 thereby converting theelectromagnetic wave2502 to an electrical signal atstep2414 which can be processed by a processing device (e.g., a receiver circuit and microprocessor). To prevent interference between electromagnetic waves transmitted by theMMICs2524, a remote waveguide system that transmitted theelectromagnetic wave2504 that is received by thewaveguide2522 ofFIG. 25A can be adapted to transmit theelectromagnetic wave2504 at a different operating frequency, different wave mode, different phase, or other adjustable operational parameter to avoid interference. Electromagnetic waves can be received by thewaveguide2522 ofFIG. 25B in a similar manner as described above.
• Turning now toFIG. 25C, thewaveguide2522 ofFIG. 25B can be adapted to supporttransmission mediums2528 that have no endpoints such as shown inFIG. 25C. In this illustration, thewaveguide2522 comprises achamber2525 in afirst region2506 of thecore2528. Thechamber2525 creates agap2527 between anouter surface2521 of thecore2528 and theinner surface2523 of thewaveguide2522. Thegap2527 provides sufficient room for placement of theMMICs2524 on theinner surface2523 of thewaveguide2522. To enable thewaveguide2522 to receive electromagnetic waves from either direction, thewaveguide2522 can be configured with symmetrical regions:2508 and2508′,2510 and2510′, and2512, and2512′. In thefirst region2506, thechamber2525 of thewaveguide2522 has two taperedstructures2522B′ and2522B″. Thesetapered structures2522B′ and2522B″ enable an electromagnetic wave to gradually enter or exit thechamber2525 from either direction of thecore2528. TheMMICs2524 can be configured with directional antennas to launch a firstelectromagnetic wave2502 directed from east-to-west or from west-to-east in relation to the longitudinal view of thecore2528. Similarly, the directional antennas of theMMICs2524 can be configured to receive an electromagnetic waves propagating longitudinally on the core2528 from east-to-west or from west-to-east. The process for transmitting electromagnetic waves is similar to that described forFIG. 25B depending on whether the directional antennas of theMMICs2524 are transmitting from east-to-west or from west-to-east.
• Although not shown, thewaveguide2522 ofFIG. 25C can be configured with a mechanism such as one or more hinges that enable splitting thewaveguide2522 into two parts that can be separated. The mechanism can be used to enable installation of thewaveguide2522 onto acore2528 without endpoints. Other mechanisms for installation of thewaveguide2522 ofFIG. 25C on acore2528 are contemplated by the subject disclosure. For example, thewaveguide2522 can be configured with a slot opening that spans the entire waveguide structure longitudinally. In a slotted design of thewaveguide2522, theregions2522C′ and2522C of thewaveguide2522 can be configured so that theinner surface2523 of thewaveguide2522 is tightly coupled to the outer surface of thecore2528. The tight coupling between theinner surface2523 of thewaveguide2522 the outer surface of thecore2528 prevents sliding or movement of thewaveguide2522 relative to thecore2528. A tight coupling in theregions2522C′ and2522C can also be applied to a hinged design of thewaveguide2522.
• Thewaveguides2522 shown inFIGS. 25A, 25B and 25C can be adapted to perform one or more embodiments described in other figures of the subject disclosure. Accordingly, it is contemplated that such embodiments can be applied to thewaveguide2522 ofFIGS. 25A, 25B and 25C. Additionally, any adaptations in the subject disclosure of a core can be applied to thewaveguide2522 ofFIGS. 25A, 25B and 25C.
• While for purposes of simplicity of explanation, the respective processes are shown and described as a series of blocks inFIG. 24, it is to be understood and appreciated that the claimed subject matter is not limited by the order of the blocks, as some blocks may occur in different orders and/or concurrently with other blocks from what is depicted and described herein. Moreover, not all illustrated blocks may be required to implement the methods described herein.
• It is further noted that thewaveguide launchers2522 ofFIGS. 25A-25D and/or other waveguide launchers described and shown in the figures of the subject disclosure (e.g.,FIGS. 7-14, 18N-18W, 22A-22B and other drawings) and any methods thereof can be adapted to generate on a transmission medium having an outer surface composed of, for example, a dielectric material (e.g., insulation, oxidation, or other material with dielectric properties) a single wave mode or combination of wave modes that reduce propagation losses when propagating through a substance, such as a liquid (e.g., water produced by humidity, snow, dew, sleet and/or rain), disposed on the outer surface of the transmission medium.
• FIGS. 25E, 25F, 25G, 25H, 25I, 25J, 25K, 25L, 25M, 25N, 25O, 25P, 25Q, 25R, 25S and 25T are block diagrams illustrating example, non-limiting embodiments of wave modes (and electric field plots associated therewith) that can be generated on an outer surface of a transmission medium by one or more of the waveguides of the subject disclosure and adaptations thereof. Turning first toFIG. 25E, an illustration is provided that depicts a longitudinal cross-section of atransmission medium2542. Thetransmission medium2542 can comprise aconductor2543, a dielectric material2544 (e.g., insulation, oxidation, etc.) disposed on theconductor2543, and a substance/water film2545 (or other accumulation of water, liquid, or other substance) disposed on the outer surface of thedielectric material2544. Thetransmission medium2542 can be exposed to a gaseous substance such as atmosphere or air2546 (or can be located in a vacuum). The respective thicknesses of theconductor2543,dielectric material2544, andwater film2545 are not drawn to scale and are therefore meant only to be illustrative. Although not shown inFIG. 25E, theconductor2543 can be a cylindrical conductor e.g., single conductor, braided multi-strand conductor, etc.) surrounded by thedielectric material2544, andair2546. To simplify the illustration of the subject disclosure, only a portion of theconductor2543 near the upper (or first) surface is shown. Furthermore, a symmetrical portion of thedielectric material2544,water film2545, andair2546, which would be located under (or on an opposite/bottom side of) theconductor2543, in the longitudinal cross section ofFIG. 25E, is not shown.
• In certain embodiments, gravitational forces can cause thewater film2545 to be concentrated predominantly on a limited portion of the outer surface of the transmission medium2542 (e.g., on a bottom side of the transmission medium2542). It is therefore not necessary in the present illustration for the outer surface of the dielectric material to be completely surrounded by thewater film2545. It is further noted that thewater film2545 can be droplets or beads of water rather than a contiguous water film. AlthoughFIG. 25E illustrates an insulated conductor (i.e.,conductor2543 surrounded by the dielectric material2544), other configurations of thetransmission medium2542 are possible and applicable to the subject disclosure, such as, for example, atransmission medium2542 composed of a bare wire or other uninsulated conductor or solely of a dielectric material of various structural shapes (e.g., cylindrical structure, rectangular structure, square structure, etc.).
• FIG. 25E further depicts electric fields of a fundamental transverse magnetic wave mode in the form of TM00 wave mode, sometimes referred to as the Goubau wave mode, launched onto the outer surface of thetransmission medium2542 by one of the waveguide launchers described in the subject disclosure or an adaptation thereof and that travels in a longitudinal direction along thetransmission medium2542 corresponding to the direction of wave propagation shown. Electromagnetic waves that propagate along a transmission medium via a transverse magnetic (TM) mode have electric fields with both radial rho-field components that extend radially outward from the transmission medium and are perpendicular to the longitudinal direction and longitudinal z-field components that vary as a function of time and distance of propagation that are parallel to the longitudinal direction but no azimuthal phi-field components that are perpendicular to both the longitudinal direction and the radial direction.
• The TM00 Goubau wave mode produces electric fields with predominant radial rho-field components extending away from the conductor at a high field strength throughout the dielectric in theregion2550. The TM00 Goubau wave mode also produces electric fields with predominant radial rho-field components extending into the conductor at a high field strength throughout the dielectric in theregion2550″. Furthermore, in theregion2550′ betweenregions2550 and2550″, electric fields with smaller magnitudes and with predominant longitudinal z-field components are produced. The presence of these electric fields inside the dielectric produces some attenuation, but losses in these regions are insignificant compared with the effects of a thin water film as will be discussed below.
• An expandedview2548 of a small region of the transmission medium2542 (depicted by a dashed oval) is shown at the bottom right ofFIG. 25E. The expandedview2548 depicts a higher resolution of the electric fields present in the small region of thetransmission medium2542. The expanded view shows electric fields in thedielectric material2544, thewater film2545 and theair2546. A substantial portion of the electric fields depicted inregion2547 of the expandedview2548 has a significant longitudinal component, particularly in the region near the outer surface of thedielectric material2544 in an area of thewater film2545. As an electromagnetic wave exhibiting a TM00 (Goubau) wave mode propagates longitudinally (left-to-right or right-to-left), the areas of strong longitudinal component of the electric fields shown inregion2547 cause the electric field to traverse a greater portion of thewater film2545 thereby causing substantial propagation losses, which can be in the order of 200 dB/M of attenuation for frequencies in the range of 24-40 GHz, for example.
• FIG. 25F depicts a cross-sectional longitudinal view of simulated electromagnetic waves having a TM00 (Goubau) wave mode, and the effects when such waves propagate on a dry versuswet transmission medium2542 implemented as a 1-meter (in length) insulated conductor. For illustration purposes only, the simulation assumes a lossless insulator to focus the analysis on a degree of attenuation caused by a 0.1 mm water film. As shown in the illustration, when electromagnetic waves having the TM00 (Goubau) wave mode propagate on the dry transmission medium2452, the waves experience minimal propagation losses. In contrast, when the same electromagnetic waves having the TM00 (Goubau) wave mode propagate in thewet transmission medium2542, they experience significant propagation losses greater than 200 dB in attenuation over the 1 meter length of the insulated conductor for frequencies in the range of 24-40 GHz, for example.
• FIG. 25G illustrates a simulation depicting the magnitude and frequency properties of electromagnetic waves having a TM00 Goubau wave mode that propagate on a dryinsulated conductor2542 versus a wetinsulated conductor2542. For illustration purposes only, the simulation assumes a lossless insulator to focus the analysis on the degree of attenuation caused by a 0.1 mm water film. The plots show that when thetransmission medium2542 is wet, electromagnetic waves having a TM00 Goubau wave mode experience attenuations of approximately 200 dB/M for a range of frequencies of 24-40 GHz. In contrast, the plot for the dryinsulated conductor2542 experiences nearly no attenuation in the same range of frequencies.
• FIGS. 25H and 25I illustrate electric field plots of an electromagnetic wave having TM00 Goubau wave mode with an operating frequency of 3.5 GHz and 10 GHz, respectively. Although the vertical axis represents field intensity and not distance, hash lines have been superimposed on the plots ofFIGS. 25H and 25I (as well as the plots ofFIGS. 25M-25S) to depict the respective portions of the conductor, insulator and water film relative to their position indicated by the x-axis. While the field strengths were calculated inFIGS. 25H and 25I (as well as the plots ofFIGS. 25M-25S) based on a condition where no water is present, the plot shown inFIG. 25H nevertheless helps explain why a TM00 Goubau wave mode at lower frequencies has low propagation losses when water is present on the outer surface of thedielectric material2544 in the position shown.
• To understand the plots ofFIGS. 25H and 25I, it is important to understand the difference between radial rho-fields and longitudinal z-fields. When viewing a longitudinal cross-section of atransmission medium2542 such as shown inFIG. 25E, rho-fields represent electric fields that extend radially outward from or inward to (perpendicular to the longitudinal axis) theconductor2543 through thedielectric material2544, awater film2545 that may be present, and theair2546. In contrast, z-fields are electric fields that are aligned with thedielectric material2544, thewater film2545, or theair2546 in a manner that is parallel to the longitudinal axis of thetransmission medium2542. A propagating electromagnetic wave having solely electric field components that are radial or perpendicular to awater film2545 does not experience a significant loss in field strength as the electromagnetic wave propagates longitudinally (from left-to-right or right-to-left) along the outer surface of thetransmission medium2542. In contrast, a propagating electromagnetic wave having electric field components that are parallel (or longitudinal), i.e., z-fields aligned with thewater film2545, having a field strength substantially greater than 0 will experience a substantial loss in field strength (i.e., propagation loss) as the electromagnetic wave propagates longitudinally (from left-to-right or right-to-left) along the outer surface of thetransmission medium2542.
• In the case of a TM00 Goubau wave mode at 3.5 GHz as shown in the plot ofFIG. 25H, the z-field component of the electric fields has a field strength that is small relative to the rho-field (radial) component beginning from the outer surface of thedielectric material2544 and through the position where awater film2545 could be present as shown inFIG. 25H. In particular, the plot25H indicates the magnitude of the field strength of the rho-field and z-field components, at a point in time when they are at their peak, as a function of radial distance away from the center of a transmission medium. While the field strengths were calculated based on a condition where no water is present, the plot shown inFIG. 25G nevertheless helps explain why a TM00 Goubau wave mode at lower frequencies has low propagation losses when water is present on the outer surface of thedielectric material2544 in the position shown. Indeed, according to an embodiment, where the electric fields have large radial components (e.g., radial rho fields) that are perpendicular to the propagation direction, and conversely relatively small longitudinal components (e.g., z-fields) at the region of the substance/water film, then there can be relatively low propagation losses. Consequently, an electromagnetic wave having a TM00 Goubau wave mode at 3.5 GHz will not experience a substantial attenuation when thewater film2545 is disposed on the outer surface of the dielectric material2544 (due to rain, snow, dew, sleet and/or excess humidity). This is not true for all frequencies however, particularly as frequencies approach the millimeter wave range.
• For instance,FIG. 25I depicts a plot of a TM00 wave mode at 10 GHz. In this plot, the field strength of the z-field component in the region of the water film is relatively large when compared to the rho-field (radial) component. Consequently, propagation losses are very high.FIG. 25J shows that when a water film having a thickness of 0.1 mm is present on the external surface of the insulated conductor, a TM00 wave mode at 4 GHz experiences an attenuation of 0.62 dB/M which is significantly lower than a TM00 wave mode at 10 GHz, which experiences an attenuation of 45 dB/M. Accordingly, a TM00 wave mode operating at high frequencies reaching millimeter wave frequencies can experience a substantial propagation loss when a water film is present on the outer surface of a transmission medium.
• Turning now toFIG. 25K, an illustration is provided that depicts an electromagnetic wave having a TM01 wave mode (e.g., a non-fundamental wave mode) that propagates on the outer surface of thedielectric material2544. In the expandedview2548,region2547 illustrates that the electric fields of the electromagnetic wave having a TM01 wave mode have a significant radial rho-field component, and insignificant longitudinal z-field component in the region near the outer surface of thedielectric material2544 in an area of thewater film2545. TM01 wave modes have a cutoff frequency greater than zero Hertz. When the electromagnetic wave having a TM01 wave mode is configured by a waveguide launcher of the subject disclosure (an adaptation thereof or other launcher) to operate in a frequency range near its cutoff frequency, a small fraction of power is carried by thedielectric material2544, while most of the power is concentrated in theair2546.
• The TM01 wave mode produces electric fields in theregion2551 with predominant radial rho-field components extending away from the conductor that reverse in the dielectric2544 and point inward from the air into the dielectric2544 at the surface of the dielectric. The TM01 wave mode also produces electric fields in theregion2551″ with predominant radial rho-field components extending into the conductor that reverse in the dielectric2544 and point outward into the air from the dielectric2544 at the surface of the dielectric. Furthermore, in theregion2551′ betweenregions2551 and2551″, electric fields with predominant longitudinal z-field components are produced within thedielectric layer2544. As in the case of the TM00 mode, the presence of these electric fields inside the dielectric2544 produces some attenuation, but losses in these regions may not be significant enough to prevent propagation of a TM01 wave over significant distances.
• Additionally, the electric fields of the TM01 wave mode inregion2547 of thewater film2545 are predominantly radial and have relatively insignificant longitudinal components. Consequently, the propagating wave does not experience large propagation losses as the electromagnetic wave with this field structure propagates longitudinally (from left-to-right or right-to-left) along the outer surface of thetransmission medium2542.
• FIG. 25L depicts a cross-sectional longitudinal view of electromagnetic waves having a TM01 wave mode, and the effects when such waves propagate on a dry versuswet transmission medium2542 at a millimeter wave frequency or slightly below. As shown in the illustration, when electromagnetic waves having the TM01 wave mode propagate on the dry transmission medium2452, the waves experience minimal propagation losses. In contrast to the electromagnetic wave having a TM00 Goubau wave mode at similar frequencies, when the electromagnetic waves having TM01 wave mode propagate in thewet transmission medium2542, they experience only a modest additional attenuation. Electromagnetic waves having a TM01 wave mode in a millimeter frequency range, for example, are therefore much less susceptible to increased propagation losses due to the presence of thewater film2545 than electromagnetic waves having a TM00 Goubau wave mode in this same frequency range.
• FIG. 25M provides an illustration of an electric field plot of a radial rho-field component and longitudinal z-field component of the electric fields of a TM01 wave mode having an operating frequency at 30.437 GHz, which is 50 MHz above its cutoff frequency. The cutoff frequency is at 30.387 GHz based on a 4 mm radius of theconductor2543 and 4 mm thickness of thedielectric material2544. A higher or lower cutoff frequency for a TM01 wave mode is possible when the dimensions of theconductor2543 anddielectric material2544 differ from the present illustration. In particular, the plot indicates the magnitude of the field strength of the rho-field and z-field components, at a point in time when they are at their peak, as a function of radial distance away from the center of a transmission medium. While the field strengths were calculated based on a condition where no water is present, the plot shown inFIG. 25M nevertheless helps explain why a TM01 wave mode has low propagation losses when water is present on the outer surface of thedielectric material2544 in the position shown. As noted earlier, electric fields that are substantially perpendicular to thewater film2545 do not experience a significant loss in field strength, while electric fields that are parallel/longitudinal to the outer surface of thedielectric material2544 within the area of thewater film2545 will experience a substantial loss in field strength as the electromagnetic wave having this field structure propagates along thetransmission medium2542.
• In the case of a TM01 wave mode, the longitudinal z-field component of the electric fields can have a field strength that is extremely small relative to the magnitude of the radial field beginning from the outer surface of thedielectric material2544 and through thewater film2545 as shown inFIG. 25M. Consequently, an electromagnetic wave having a TM01 wave mode at 30.437 GHz will experience much less attenuation than a TM00 Goubau wave mode at a frequency greater than 6 GHz (e.g., at 10 GHz—seeFIG. 25J) when awater film2545 is disposed on the outer surface of the dielectric material2544 (due to rain, dew, snow, sleet and/or excess humidity).
• FIG. 25N illustrates a plot depicting the magnitude and frequency properties of electromagnetic waves having a TM01 wave mode that propagate on adry transmission medium2542 versus awet transmission medium2542. The plots show that when thetransmission medium2542 is wet, electromagnetic waves having a TM01 wave mode experience a modest attenuation when the TM01 wave mode is operating in a frequency range (e.g., 28 GHz-31 GHz) near its cutoff frequency. In contrast, the TM00 Goubau wave mode experiences a significant attenuation of 200 dB/M as shown in the plot ofFIG. 25G over this same frequency range. The plot ofFIG. 25N thus confirms the results of the dry versus wet simulations shown inFIG. 25L.
• FIGS. 25O, 25P, 25Q, 25R and 25S depict other wave modes that can exhibit similar properties like those shown for a TM01 wave mode. For example,FIG. 25O provides an illustration of an electric field plot of a radial rho-field component and a longitudinal z-field component of the electric fields of a TM02 wave mode having an operating frequency at 61.121 GHz, which is 50 MHz above its cutoff frequency. As noted above, the cutoff frequency can be higher or lower when the dimensions of theconductor2543 anddielectric material2544 differ from the present illustration. In particular, the plot indicates the magnitude of the field strength of the rho-field and z-field components, at a point in time when they are at their peak, as a function of radial distance away from the center of a transmission medium. While the field strengths were calculated based on a condition where no water is present, the z-field component of the electric fields can have a field strength that is extremely small relative to the magnitude of the radial rho-field beginning from the outer surface of thedielectric material2544 and through the position that would be occupied by thewater film2545 as shown inFIG. 25O. Consequently, an electromagnetic wave exhibiting a TM02 wave mode will experience much less attenuation due to an accumulation of water on an outer surface of a dielectric layer than wave modes with more significant longitudinal z-field components in a position corresponding to the water film.
• FIG. 25P provides an illustration of an electric field plot of a radial rho-field component, a longitudinal z-field component, and an azimuthal phi-field component of the electric fields of a hybrid wave mode; specifically, an EH11 wave mode having an operating frequency at 31.153 GHz, which is 50 MHz above its cutoff frequency. As before, the cutoff frequency in the illustration ofFIG. 25P can be higher or lower depending on the dimensions of theconductor2543 anddielectric material2544.
• Non-TM wave modes such as hybrid EH wave modes can have azimuthal field components that are perpendicular to the radial rho-field and longitudinal z-field components and that tangentially encircle the circumference of thetransmission medium2542 in a clockwise and/or counterclockwise direction Like the z-field components, phi-field (azimuthal) components at the outer surface of the dielectric2544 can cause significant propagation losses in the presence of a thin film ofwater2545. The plot ofFIG. 25P indicates the magnitudes of the field strength of the rho-field, phi-field and z-field components, at a point in time when they are at their peak, as a function of radial distance away from the center of atransmission medium2542. While the field strengths were calculated based on a condition where no water is present, the z-field and phi-field components of the electric field each have a field strength that is very small relative to the magnitude of the radial field beginning from the outer surface of thedielectric material2544 and through the position that would be occupied by thewater film2545. Consequently, an electromagnetic wave having an EH11 wave mode will experience much less attenuation due to an accumulation of water on an outer surface of a dielectric layer than wave modes with more significant longitudinal z-field and phi-field components in a position corresponding to the water film.
• FIG. 25Q provides an illustration of an electric field plot of a radial rho-field component, a longitudinal z-field component, and an azimuthal phi-field component of the electric fields of a higher order hybrid wave mode; specifically, an EH12 wave mode having an operating frequency at 61.5 GHz, which is 50 MHz above its cutoff frequency. As before, the cutoff frequency can be higher or lower depending on the dimensions of theconductor2543 anddielectric material2544. In particular, the plot indicates the magnitudes of the field strength of the rho-field, phi-field and z-field components, at a point in time when they are at their peak, as a function of radial distance away from the center of a transmission medium. While the field strengths were calculated based on a condition where no water is present, the z-field and phi-field components of the electric field each have a field strength that is very small relative to the magnitude of the radial field beginning from the outer surface of thedielectric material2544 and through the position that would be occupied by thewater film2545. Consequently, an electromagnetic wave exhibiting an EH12 wave mode will experience much less attenuation due to an accumulation of water on an outer surface of a dielectric layer than wave modes with more significant longitudinal z-field and phi-field components in a position corresponding to the water film.
• FIG. 25R provides an illustration of an electric field plot of a radial rho-field component, a longitudinal z-field component, and an azimuthal phi-field component of the electric fields of a hybrid wave mode; specifically, an HE22 wave mode having an operating frequency at 36.281 GHz, which is 50 MHz above its cutoff frequency. As before, the cutoff frequency can be higher or lower depending on the dimensions of theconductor2543 anddielectric material2544. In particular, the plot indicates the magnitudes of the field strength of the rho-field, phi-field and z-field components, at a point in time when they are at their peak, as a function of radial distance away from the center of a transmission medium. While the field strengths were calculated based on a condition where no water is present, the z-field and phi-field components of the electric field each have a field strength that is small relative to the magnitude of the radial field beginning from the outer surface of thedielectric material2544 and through the position that would be occupied by thewater film2545. Consequently, an electromagnetic wave exhibiting an EH22 wave mode will experience much less attenuation due to an accumulation of water on an outer surface of a dielectric layer than wave modes with more significant longitudinal z-field and phi-field components in a position corresponding to the water film.
• FIG. 25S provides an illustration of an electric field plot of a radial rho-field component, a longitudinal z-field component, and an azimuthal phi-field component of the electric fields of a higher order hybrid wave mode; specifically, an HE23 wave mode having an operating frequency at 64.425 GHz, which is 50 MHz above its cutoff frequency. As before, the cutoff frequency can be higher or lower depending on the dimensions of theconductor2543 anddielectric material2544. In particular, the plot indicates the magnitudes of the field strength of the rho-field, phi-field and z-field components, at a point in time when they are at their peak, as a function of radial distance away from the center of a transmission medium. While the field strengths were calculated based on a condition where no water is present, the z-field and phi-field components of the electric field each have a field strength that is small relative to the magnitude of the radial field beginning from the outer surface of thedielectric material2544 and through the position that would be occupied by thewater film2545. Consequently, an electromagnetic wave exhibiting an HE23 wave mode will experience much less attenuation due to an accumulation of water on an outer surface of a dielectric layer than wave modes with more significant longitudinal z-field and phi-field components in a position corresponding to the water film.
• Based on the observations of the electric field plots ofFIGS. 25M and 25O, it can be said that electromagnetic waves having a TM0m wave mode, where m>0, will experience less propagation losses than wave modes with more significant longitudinal z-field and/or phi-field components in a position corresponding to the water film. Similarly, based on the observations of the electric field plots ofFIGS. 25P-25Q, it can be said that electromagnetic waves having an EH1m wave mode, where m>0, will experience less propagation losses than wave modes with more significant longitudinal z-field and/or phi-field components in a position corresponding to the water film. Additionally, based on the observations of the electric field plots ofFIGS. 25R-25S, it can be said that electromagnetic waves having an HE2m wave mode, where m>1, will experience less propagation losses than wave modes with more significant longitudinal z-field and/or phi-field components in a position corresponding to the water film.
• It is further noted that thewaveguide launchers2522 ofFIGS. 25A-25D and/or other waveguide launchers described and shown in the figures of the subject disclosure (e.g.,FIGS. 7-14, 18N-18W, 22A-22B and other drawings) can be adapted to generate or induce on a transmission medium having an outer surface composed of, for example, a dielectric material (e.g., insulation, oxidation, or other material with dielectric properties) an electromagnetic wave having a TM0m wave mode or an EH1m wave mode (where m>0), an HE2m wave mode (where m>1), or any other type of wave mode that exhibits a low field strength for a z-field component (and azimuthal field component if present) in a proximal region above the outer surface of the transmission medium where a water film may be present. Since certain wave modes have electric field structures near an out surface of a transmission medium that are less susceptible to propagation losses, the waveguide launchers of the subject disclosure can be adapted to generate singly, or when suitable, in combination, an electromagnetic wave(s) having the aforementioned wave mode properties to reduce propagation losses when propagating through a substance, such as a liquid (e.g., water produced by humidity and/or rain), disposed on the outer surface of the transmission medium. It is further noted that in certain embodiments the transmission medium used to propagate one or more of the aforementioned wave modes can be composed solely of a dielectric material.
• Referring back to the TM01 wave mode ofFIG. 25K, it is also noted that theregion2549 in the expandedview2548 shows electric field vectors exhibiting the behavior of an eddy (e.g., a circular or whirlpool-like pattern). Although it would appear that certain electric field vectors inregion2549 have longitudinal field components located within thewater film2545, such vectors have a very low field strength and are also substantially less in quantity when compared to the higher strength radial field components located within region2547 (without including region2549). Nevertheless, the few electric field vectors with non-zero longitudinal components inregion2549 can be a contributing factor to the modest attenuation described earlier in relation to thewet transmission medium2542 ofFIG. 25L. The adverse effects of the electric field vectors in thesmall eddy region2549 ofFIG. 25K are substantially less than the adverse effects caused by the substantial number of electric field vectors with significant longitudinal components inregion2547 of the TM00 Gaubau wave mode ofFIG. 25E, which have a much higher field strength and are within thewater film2545. As noted earlier, the electric field vectors inregion2547 of the TM00 Gaubau wave mode cause a much higher propagation loss (as much as 200 dB/M attenuation) at frequencies above 6 GHz as depicted by thewet transmission medium2542 ofFIGS. 25F-25G, 25I and 25J, which is not the case for a TM01 wave mode.
• It is also noted that the electric field depictions inFIGS. 25E and 25K are not static in time and space. That is, as an electromagnetic wave propagates in space longitudinally along a transmission medium, the electric fields associated with the electromagnetic wave change when viewed at a static location of the transmission medium as time progresses. Consequently, the electric field plots shown inFIGS. 25H, 25I, 25M and 25O-25S, are non-static and can expand and contract, as well as, reverse in polarity. Even though the electric field plots are not static, the average field strength of the z-field component (and azimuthal field component when present) for a TM0m wave mode and EH1m wave mode (where m>0), and HE2m wave mode (where m>1) is substantially lower than that exhibited by z-field component of a TM00 Goubau wave mode above 6 GHz. Consequently, a TM0m wave mode and EH1m wave mode (where m>0), and HE2m wave mode (where m>1) experience a much lower propagation loss than a TM00 Goubau wave mode in the range of frequencies above 6 GHz in the presence of awater film2545.
• It is further noted that the electric fields of a TM00 Goubau wave mode differ substantially from a TM0m wave mode and EH1m wave mode (where m>0), and a HE2m wave mode (where m>1). Take for instance the electric fields of a TM00 Goubau wave mode and a TM01 wave mode depicted in an orthogonal cross-sectional view of thetransmission medium2542 shown inFIG. 25T. The TM00 Goubau wave mode depicts radial electric fields extending away from the conductor at a high field strength throughout the dielectric. This behavior is depicted in theregion2550 ofFIG. 25E at an instance in time and space of thetransmission medium2542. In contrast, the TM01 wave mode depicts electric fields that extend away from the conductor, decrease substantially in field strength at a midpoint of the dielectric, and reverse in polarity and increase in field strength towards the outer surface of the dielectric. This behavior is depicted in theregion2551 ofFIG. 25K at an instance in time and space of thetransmission medium2542.
• If the cross-sectional slice shown inFIG. 25T remains the same as time progresses, in the TM00 Goubau wave mode, the electric fields inregion2550′ (ofFIG. 25E) will in time reach the cross-sectional slice decreasing in field strength, and suddenly reversing polarity as the electric fields inregion2550″ reach the cross-sectional slice. In contrast, in the TM01 wave mode, the electric fields inregion2551′ (ofFIG. 25K) will in time reach the cross-sectional slice becoming longitudinal (i.e., pointing out of the drawing ofFIG. 25T), thereby causing the electric fields shown inFIG. 25T for the TM01 wave mode to appear to disappear, and then returning with the polarities reversed from what is shown inFIG. 25T as the electric fields inregion2551″ reach the cross-sectional slice.
• It will be appreciated that the electromagnetic wave modes described inFIGS. 25E-25T and in other sections of the subject disclosure can be launched singly or in combination as multiple wave modes in whole or in part on an outer surface, or embedded within any one of the transmission media described in the subject disclosure (e.g.,FIGS. 18A-18L). It is further noted that these electromagnetic wave modes can be converted into wireless signals by any of the antennas described in the subject disclosure (e.g.,FIGS. 18M, 19A-19F, 20A-20F) or converted from wireless signals received by an antenna back to one or more electromagnetic wave modes that propagate along one of the aforementioned transmission media. The methods and systems described in the subject disclosure can also be applied to these electromagnetic wave modes for purposes of transmission, reception or processing of these electromagnetic wave modes, or adaptation or modification of these electromagnetic wave modes. It is further noted that any of the waveguide launchers (or adaptions thereof) can be configured to induce or generate on a transmission medium one or more electromagnetic waves having a target field structure or target wave mode that exhibits a spatial alignment of electric fields for purposes of reducing propagation losses and/or signal interference. The waveguide device ofFIG. 25U provides a non-limiting illustration of an adaptation of the waveguide launchers of the subject disclosure.
• Referring now toFIG. 25U, there is illustrated a diagram of an example, non-limiting embodiment of awaveguide device2522 in accordance with various aspects described herein. Thewaveguide device2522 is similar to thewaveguide device2522 shown inFIG. 25C with a few adaptations. In the illustration ofFIG. 25U, thewaveguide device2522 is coupled to atransmission medium2542 comprising aconductor2543 andinsulation layer2543, which together form an insulated conductor such as the one shown in drawings ofFIGS. 25E and 25K. Although not shown, thewaveguide device2522 can be constructed in two halves, which can be connected together at one longitudinal end with one or more mechanical hinges to enable opening a longitudinal edge at an opposite end of the one or more hinges for placement of thewaveguide device2522 over thetransmission medium2542. Once placed, one or more latches at the longitudinal edge opposite the one or more hinges can be used to secure thewaveguide device2522 to thetransmission medium2542. Other embodiments for coupling thewaveguide device2522 to thetransmission medium2542 can be used and are therefore contemplated by the subject disclosure.
• Thechamber2525 of thewaveguide device2522 ofFIG. 25U includes adielectric material2544′. Thedielectric material2544′ in thechamber2525 can have a dielectric constant similar to the dielectric constant of thedielectric layer2544 of the insulated conductor. Additionally, adisk2525′ having a center-hole2525″ can be used to divide thechamber2525 in two halves for transmission or reception of electromagnetic waves. Thedisk2525′ can be constructed of a material (e.g., carbon, metal or other reflective material) that does not allow electromagnetic waves to progress between the halves of thechamber2525. TheMMICs2524′ can be located inside thedielectric material2544′ of thechamber2525 as shown inFIG. 25U. Additionally, theMMICs2524′ can be located near an outer surface of thedielectric layer2543 of thetransmission medium2542.FIG. 25U shows an expandedview2524A′ of anMMIC2524′ that includes anantenna2524B′ (such as a monopole antenna, dipole antenna or other antenna) that can be configured to be longitudinally aligned with the outer surface of thedielectric layer2543 of thetransmission medium2542. Theantenna2524B′ can be configured to radiate signals that have a longitudinal electric field directed east or west as will be discussed shortly. It will be appreciated that other antenna structures that can radiate signals that have a longitudinal electric field can be used in place of thedipole antenna2524B′ ofFIG. 25U.
• It will be appreciated that although twoMMICs2524′ are shown in each half of thechambers2525 of thewaveguide device2522, more MMICs can be used. For example,FIG. 18W shows a transverse cross-sectional view of a cable (such as the transmission medium2542) surrounded by a waveguide device with8 MMICs located in positions: north, south, east, west, northeast, northwest, southeast, and southwest. The twoMMICs2524′ shown inFIG. 25U can be viewed, for illustration purposes, asMMICs2524′ located in the north and south positions shown inFIG. 18W. Thewaveguide device2522 ofFIG. 25U can be further configured withMMICs2524′ at western and eastern positions as shown inFIG. 18W. Additionally, thewaveguide device2522 ofFIG. 25U can be further configured with MMICs at northwestern, northeastern, southwestern and southeastern positions as shown inFIG. 18W. Accordingly, thewaveguide device2522 can be configured with more than the 2 MMICs shown inFIG. 25U.
• With this in mind, attention is now directed toFIGS. 25V, 25W, 25X, which illustrate diagrams of example, non-limiting embodiments of wave modes and electric field plots in accordance with various aspects described herein.FIG. 25V illustrates the electric fields of a TM01 wave mode. The electric fields are illustrated in a transverse cross-sectional view (top) and a longitudinal cross-sectional view (below) of a coaxial cable having a center conductor with an external conductive shield separated by insulation.FIG. 25W illustrates the electric fields of a TM11 wave mode. The electric fields are also illustrated in a transverse cross-sectional view and a longitudinal cross-sectional view of a coaxial cable having a center conductor with an external conductive shield separated by an insulation.FIG. 25X further illustrates the electric fields of a TM21 wave mode. The electric fields are illustrated in a transverse cross-sectional view and a longitudinal cross-sectional view of a coaxial cable having a center conductor with an external conductive shield separated by an insulation.
• As shown in the transverse cross-sectional view, the TM01 wave mode has circularly symmetric electric fields (i.e., electric fields that have the same orientation and intensity at different azimuthal angles), while the transverse cross-sectional views of the TM11 and TM21 wave modes shown inFIGS. 25W-25X, respectively, have non-circularly symmetric electric fields (i.e., electric fields that have different orientations and intensities at different azimuthal angles). Although the transverse cross-sectional views of the TM11 and TM21 wave modes have non-circularly symmetric electric fields, the electric fields in the longitudinal cross-sectional views of the TM01, TM11 and TM21 wave modes are substantially similar with the exception that that the electric field structure of the TM11 wave mode has longitudinal electric fields above the conductor and below the conductor that point in opposite longitudinal directions, while the longitudinal electric fields above the conductor and below the conductor for the TM01 and TM21 wave modes point in the same longitudinal direction.
• The longitudinal cross-sectional views of the coaxial cable ofFIGS. 25V, 25W and 25X can be said to have a similar structural arrangement to the longitudinal cross-section of thewaveguide device2522 inregion2506′ shown inFIG. 25U. Specifically, inFIGS. 25V, 25W and 25X the coaxial cable has a center conductor and a shield separated by insulation, whileregion2506′ of thewaveguide device2522 has acenter conductor2543, adielectric layer2544, covered by thedielectric material2544′ of thechamber2525, and shielded by the reflectiveinner surface2523 of thewaveguide device2522. The coaxial configuration inregion2506′ of thewaveguide device2522 continues in the taperedregion2506″ of thewaveguide device2522. Similarly, the coaxial configuration continues inregions2508 and2510 of thewaveguide device2522 with the exception that nodielectric material2544′ is present in these regions other than thedielectric layer2544 of thetransmission medium2542. At theouter region2512, thetransmission medium2542 is exposed to the environment (e.g., air) and thus the coaxial configuration is no longer present.
• As noted earlier, the electric field structure of a TM01 wave mode is circularly symmetric in a transverse cross-sectional view of the coaxial cable shown inFIG. 25V. For illustration purposes, it will be assumed that thewaveguide device2522 ofFIG. 25U has 4 MMICs located in northern, southern, western and eastern locations as depicted inFIG. 18W. In this configuration, and with an understanding of the longitudinal and transverse electric field structures of the TM01 wave mode shown inFIG. 25V, the 4MMICs2524′ of thewaveguide device2522 inFIG. 25U can be configured to launch from a common signal source a TM01 wave mode on thetransmission medium2542. This can be accomplished by configuring the north, south, east andwest MMICs2524′ to launch wireless signals with the same phase (polarity). The wireless signals generated by the 4MMICs2524′ combine via superposition of their respective electric fields in thedielectric material2544′ of thechamber2525 and the dielectric layer2544 (since both dielectric materials have similar dielectric constants) to form a TM01electromagnetic wave2502′ bound to these dielectric materials with the electric field structure shown in longitudinal and transverse views ofFIG. 25V.
• Theelectromagnetic wave2502′ having the TM01 wave mode in turn propagates toward the taperedstructure2522B of thewaveguide device2522 and thereby becomes anelectromagnetic wave2504′ embedded within thedielectric layer2544 of thetransmission medium2542′ inregion2508. In the taperedhorn section2522D theelectromagnetic wave2504′ having the TM01 wave mode expands inregion2510 and eventually exits thewaveguide device2522 without change to the TM01 wave mode.
• In another embodiment, thewaveguide device2522 can be configured to launch a TM11 wave mode having a vertical polarity inregion2506′. This can be accomplished by configuring theMMIC2524′ in the northern position to radiate from a signal source a first wireless signal having a phase (polarity) opposite to the phase (polarity) of a second wireless signal radiated from the same signal source by thesouthern MMIC2524′. These wireless signals combine via superposition of their respective electric fields to form an electromagnetic wave having a TM11 wave mode (vertically polarized) bound to thedielectric materials2544′ and2544 with the electric field structures shown in the longitudinal and transverse cross-sectional views shown inFIG. 25W. Similarly, thewaveguide device2522 can be configured to launch a TM11 wave mode having a horizontal polarity inregion2506′. This can be accomplished by configuring theMMIC2524′ in the eastern position to radiate a first wireless signal having a phase (polarity) opposite to the phase (polarity) of a second wireless signal radiated by thewestern MMIC2524′.
• These wireless signals combine via superposition of their respective electric fields to form an electromagnetic wave having a TM11 wave mode (horizontally polarized) bound to thedielectric materials2544′ and2544 with the electric field structures shown in the longitudinal and transverse cross-sectional views shown inFIG. 25W (but with a horizontal polarization). Since the TM11 wave mode with horizontal and vertical polarizations are orthogonal (i.e., a dot product of corresponding electric field vectors between any pair of these wave modes at each point of space and time produces a summation of zero), thewaveguide device2522 can be configured to launch these wave modes simultaneously without interference, thereby enabling wave mode division multiplexing. It is further noted that the TM01 wave mode is also orthogonal to the TM11 and TM21 wave modes.
• While theelectromagnetic wave2502′ or2504′ having the TM11 wave mode propagates within the confines of theinner surfaces2523 of thewaveguide device2522 inregions2506′,2506″,2508 and2510, the TM11 wave mode remains unaltered. However, when theelectromagnetic wave2504′ having the TM11 wave mode exits thewaveguide device2522 inregion2512 theinner wall2523 is no longer present and the TM11 wave mode becomes a hybrid wave mode, specifically, an EH11 wave mode (vertically polarized, horizontally polarized, or both if two electromagnetic waves are launched inregion2506′).
• In yet other embodiments, thewaveguide device2522 can also be configured to launch a TM21 wave mode inregion2506′. This can be accomplished by configuring theMMIC2524′ in the northern position to radiate from a signal source a first wireless signal having a phase (polarity) that is in phase (polarity) to a second wireless signal generated from the same signal source by thesouthern MMIC2524′. At the same time, theMMIC2524′ in the western position is configured to radiate from the same signal source a third wireless signal that is in phase with a fourth wireless signal radiated from the same signal source by theMMIC2524′ located in the eastern position. The north andsouth MMICs2524′, however, generate first and second wireless signals of opposite polarity to the polarity of the third and fourth wireless signals generated by the western andeastern MMICs2524′. The four wireless signals of alternating polarity combine via superposition of their respective electric fields to form an electromagnetic wave having a TM21 wave mode bound to thedielectric materials2544′ and2544 with the electric field structures shown in the longitudinal and transverse cross-sectional views shown inFIG. 25X. When theelectromagnetic wave2504′ exits thewaveguide device2522 it may be transformed to a hybrid wave mode such as, for example, an HE21 wave mode, an EH21 wave mode, or a hybrid wave mode with a different radial mode (e.g., HE2m or EH2m, where m>1).
• FIGS. 25U-25X illustrate several embodiments for launching TM01, EH11, and other hybrid wave modes utilizing thewaveguide device2522 ofFIG. 25U. With an understanding of the electric field structures of other wave modes that propagate on a coaxial cable (e.g., TM12, TM22, and so on), theMMICs2524′ can be further configured in other ways to launch other wave modes (e.g., EH12, HE22, etc.) that have a low intensity z-field component and phi-field component in the electric field structures near the outer surface of atransmission medium2542, which is useful for mitigating propagation losses due to a substance such as water, droplets or other substances that can cause an attenuation of the electric fields of an electromagnetic wave propagating along the outer surface of thetransmission medium2542.
• FIG. 25Y illustrates a flow diagram of an example, non-limiting embodiment of a method2560 for sending and receiving electromagnetic waves. Method2560 can be applied towaveguides2522 ofFIGS. 25A-25D and/or other waveguide systems or launchers described and shown in the figures of the subject disclosure (e.g.,FIGS. 7-14, 18N-18W, 22A-22B and other drawings) for purposes of launching or receiving substantially orthogonal wave modes such as those shown inFIG. 25Z.FIG. 25Z depicts three cross-sectional views of an insulated conductor where a TM00 fundamental wave mode, an HE wave mode with horizontal polarization, and an HE wave mode with vertical polarization, propagates respectively. The electric field structure shown inFIG. 25Z can vary over time and is therefore an illustrative representation at a certain instance or snapshot in time. The wave modes shown inFIG. 25Z are orthogonal to each other. That is, a dot product of corresponding electric field vectors between any pair of the wave modes at each point of space and time produces a summation of zero. This property enables the TM00 wave mode, the HE wave mode with horizontal polarization, and the HE wave mode with vertical polarization to propagate simultaneously along a surface of the same transmission medium in the same frequency band without signal interference.
• With this in mind, method2560 can begin atstep2562 where a waveguide system of the subject disclosure can be adapted to receive communication signals from a source (e.g., a base station, a wireless signal transmitted by a mobile or stationary device to an antenna of the waveguide system as described in the subject disclosure, or by way of another communication source.). The communication signals can be, for example, communication signals modulated according to a specific signaling protocol (e.g., LTE, 5G, DOCSIS, DSL, etc.) operating in a native frequency band (e.g., 900 MHz, 1.9 GHz, 2.4 GHz, 5 GHz, etc.), baseband signals, analog signals, other signals, or any combinations thereof. At step2564, the waveguide system can be adapted to generate or launch on a transmission medium a plurality of electromagnetic waves according to the communication signals by up-converting (or in some instances down-converting) such communication signals to one or more operating frequencies of the plurality of electromagnetic waves. The transmission medium can be an insulated conductor as shown inFIG. 25AA, or an uninsulated conductor that is subject to environmental exposure to oxidation (or other chemical reaction based on environmental exposure) as shown inFIGS. 25AB and 25AC. In other embodiments, the transmission medium can be a dielectric material such as a dielectric core described inFIG. 18A.
• To avoid interference, the waveguide system can be adapted to simultaneously launch at step2564 a first electromagnetic wave using a TM00 wave mode, a second electromagnetic wave using an HE11 wave mode with horizontal polarization, and a third electromagnetic wave using an HE11 wave mode with vertical polarization—seeFIG. 25Z. Since the first, second and third electromagnetic waves are orthogonal (i.e., non-interfering) they can be launched in the same frequency band without interference or with a small amount of acceptable interference. The combined transmission of three orthogonal electromagnetic wave modes in the same frequency band constitutes a form of wave mode division multiplexing, which provides a means for increasing the information bandwidth by a factor of three. By combining the principles of frequency division multiplexing with wave mode division multiplexing, bandwidth can be further increased by configuring the waveguide system to launch a fourth electromagnetic wave using a TM00 wave mode, a fifth electromagnetic wave using an HE11 wave mode with horizontal polarization, and a sixth electromagnetic wave using an HE11 wave mode with vertical polarization in a second frequency band that does not overlap with the first frequency band of the first, second and third orthogonal electromagnetic waves. It will be appreciated that other types of multiplexing could be additionally or alternatively used with wave mode division multiplexing without departing from example embodiments.
• To illustrate this point, suppose each of three orthogonal electromagnetic waves in a first frequency band supports 1 GHz of transmission bandwidth. And further suppose each of three orthogonal electromagnetic waves in a second frequency band also supports 1 GHz of transmission bandwidth. With three wave modes operating in two frequency bands, 6 GHz of information bandwidth is possible for conveying communication signals by way of electromagnetic surface waves utilizing these wave modes. With more frequency bands, the bandwidth can be increased further.
• Now suppose a transmission medium in the form of an insulated conductor (seeFIG. 25AA) is used for surface wave transmissions. Further suppose the transmission medium has a dielectric layer with thickness proportional to the conductor radius (e.g., a conductor having a 4 mm radius and an insulation layer with a 4 mm thickness). With this type of transmission medium, the waveguide system can be configured to select from several options for transmitting electromagnetic waves. For example, the waveguide system can be configured at step2564 to transmit first through third electromagnetic waves using wave mode division multiplexing at a first frequency band (e.g., at 1 GHz), third through fourth electromagnetic waves using wave mode division multiplexing at a second frequency band (e.g., at 2.1 GHz), seventh through ninth electromagnetic waves using wave mode division multiplexing at a third frequency band (e.g., at 3.2 GHz), and so on. Assuming each electromagnetic wave supports 1 GHz of bandwidth, collectively the first through ninth electromagnetic waves can support 9 GHz of bandwidth.
• Alternatively, or contemporaneous with transmitting electromagnetic waves with orthogonal wave modes at step2564, the waveguide system can be configured at step2564 to transmit on the insulated conductor one or more high frequency electromagnetic waves (e.g., millimeter waves). In one embodiment, the one or more high frequency electromagnetic waves can be configured in non-overlapping frequencies bands according to one or more corresponding wave modes that are less susceptible to a water film such as a TM0m wave mode and EH1m wave mode (where m>0), or an HE2m wave mode (where m>1) as previously described. In other embodiments, the waveguide system can instead be configured to transmit one or more high frequency electromagnetic waves in non-overlapping frequency bands according to one or more corresponding wave modes that have longitudinal and/or azimuthal fields near the surface of the transmission medium that may be susceptible to water, but nonetheless exhibit low propagation losses when the transmission medium is dry. A waveguide system can thus be configured to transmit several combinations of wave modes on an insulated conductor (as well as a dielectric-only transmission medium such as a dielectric core) when the insulated conductor is dry.
• Now suppose a transmission medium in the form of an uninsulated conductor (seeFIGS. 25AB-25AC) is used for surface wave transmissions. Further consider that the uninsulated conductor or bare conductor is exposed to an environment subject to various levels of moisture and/or rain (as well as air and atmospheric gases like oxygen). Uninsulated conductors, such as overhead power lines and other uninsulated wires, are often made of aluminum which is sometimes reinforced with steel. Aluminum can react spontaneously with water and/or air to form aluminum oxide. An aluminum oxide layer can be thin (e.g., nano to micrometers in thickness). An aluminum oxide layer has dielectric properties and can therefore serve as a dielectric layer. Accordingly, uninsulated conductors can propagate not only TM00 wave modes, but also other wave modes such as an HE wave mode with horizontal polarization, and an HE wave mode with vertical polarization at high frequencies based at least in part on the thickness of the oxide layer. Accordingly, uninsulated conductors having an environmentally formed dielectric layer such as an oxide layer can be used for transmitting electromagnetic waves using wave mode division multiplexing and frequency division multiplexing. Other electromagnetic waves having a wave mode (with or without a cutoff frequency) that can propagate on an oxide layer are contemplated by the subject disclosure and can be applied to the embodiments described in the subject disclosure.
• In one embodiment, the term “environmentally formed dielectric layer” can represent an uninsulated conductor that is exposed to an environment that is not artificially created in a laboratory or other controlled setting (e.g., bare conductor exposed to air, humidity, rain, etc. on a utility pole or other exposed environment). In other embodiments, an environmentally formed dielectric layer can be formed in a controlled setting such as a manufacturing facility that exposes uninsulated conductors to a controlled environment (e.g., controlled humidity, or other gaseous substance) that forms a dielectric layer on the outer surface of the uninsulated conductor. In yet another alternative embodiment, the uninsulated conductor can also be “doped” with particular substances/compounds (e.g., a reactant) that facilitate chemical reactions with other substances/compounds that are either available in a natural environment or in an artificially created laboratory or controlled setting, thereby resulting in the creation of the environmentally formed dielectric layer.
• Wave mode division multiplexing and frequency division multiplexing can prove useful in mitigating obstructions such as water accumulating on an outer surface of a transmission medium. To determine if mitigating an obstruction is necessary, a waveguide system can be configured atstep2566 to determine if an obstruction is present on the transmission medium. A film of water (or water droplets) collected on an outer surface of the transmission medium due to rain, condensation, and/or excess humidity can be one form of an obstruction that can cause propagation losses in electromagnetic waves if not mitigated. A splicing of a transmission medium or other object coupled to the outer surface of the transmission medium can also serve as an obstruction.
• Obstructions can be detected by a source waveguide system that transmits electromagnetic waves on a transmission medium and measures reflected electromagnetic waves based on these transmissions. Alternatively, or in combination, the source waveguide system can detect obstructions by receiving communication signals (wireless or electromagnetic waves) from a recipient waveguide system that receives and performs quality metrics on electromagnetic waves transmitted by the source waveguide system. When an obstruction is detected atstep2566, the waveguide system can be configured to identify options to update, modify, or otherwise change the electromagnetic waves being transmitted.
• Suppose, for example, that in the case of an insulated conductor, the waveguide system had launched at step2564 a high order wave mode such as TM01 wave mode with a frequency band that starts at 30 GHz having a large bandwidth (e.g., 10 GHz) when the insulated conductor is dry such as shown inFIG. 25N. The illustration inFIG. 25N is based on simulations which may not take into account all possible environmental conditions or properties of a specific insulated conductor. Accordingly, a TM01 wave mode may have a lower bandwidth than shown. For illustration purposes, however, a 10 GHz bandwidth will be assumed for an electromagnetic wave having a TM01 wave mode.
• Although it was noted earlier in the subject disclosure that a TM01 wave mode has a desirable electric field alignment that is not longitudinal and not azimuthal near the outer surface, it can nonetheless be subject to some signal attenuation which in turn reduces its operating bandwidth when a water film (or droplets) accumulates on the insulated conductor. This attenuation is illustrated inFIG. 25N which shows that an electromagnetic wave having a TM01 wave mode with a bandwidth of approximately 10 GHz (30 to 40 GHz) on a dry insulated conductor drops to a bandwidth of approximately 1 GHz (30 to 31 GHz) when the insulated conductor is wet. To mitigate the loss in bandwidth, the waveguide system can be configured to launch electromagnetic waves at much lower frequencies (e.g., less than 6 GHz) using wave mode division multiplexing and frequency division multiplexing.
• For example, the waveguide system can be configured to transmit a first set of electromagnetic waves; specifically, a first electromagnetic wave having a TM00 wave mode, a second electromagnetic wave having an HE11 wave mode with horizontal polarization, and a third electromagnetic wave having an HE wave mode with vertical polarization, each electromagnetic wave having a center frequency at 1 GHz. Assuming a useable frequency band from 500 MHz to 1.5 GHz to convey communication signals, each electromagnetic wave can provide 1 GHz of bandwidth, and collectively 3 GHz of system bandwidth.
• Suppose also the waveguide system is configured to transmit a second set of electromagnetic waves; specifically, a fourth electromagnetic wave having a TM00 wave mode, a fifth electromagnetic wave having an HE11 wave mode with horizontal polarization, and a sixth electromagnetic wave having an HE11 wave mode with vertical polarization, each electromagnetic wave having a center frequency at 2.1 GHz. Assuming a frequency band from 1.6 GHz to 2.6 GHz, with a guard band of 100 MHz between the first and second sets of electromagnetic waves, each electromagnetic wave can provide 1 GHz of bandwidth, and collectively 3 GHz of additional bandwidth, thereby now providing up to 6 GHz of system bandwidth.
• Further suppose the waveguide system is also configured to transmit a third set of electromagnetic waves; specifically, a seventh electromagnetic wave having a TM00 wave mode, an eighth electromagnetic wave having an HE wave mode with horizontal polarization, and a ninth electromagnetic wave having an HE wave mode with vertical polarization, each electromagnetic wave having a center frequency at 3.2 GHz. Assuming a frequency band from 2.7 GHz to 3.7 GHz, with a guard band of 100 MHz between the second and third sets of electromagnetic waves, each electromagnetic wave can provide 1 GHz of bandwidth, and collectively 3 GHz of additional bandwidth, thereby now providing up to 9 GHz of system bandwidth.
• The combination of the TM01 wave mode, and the three sets of electromagnetic waves configured for wave mode division multiplexing and frequency division multiplexing, provide a total system bandwidth of 10 GHz, thereby restoring a bandwidth of 10 GHz previously available when the high frequency electromagnetic wave having the TM01 wave mode was propagating on a dry insulated conductor.FIG. 25AD illustrates a process for performing mitigation of a TM01 wave mode subject to an obstruction such as a water film detected atstep2566.FIG. 25AD illustrates a transition from a dry insulated conductor that supports a high bandwidth TM01 wave mode to a wet insulated conductor that supports a lower bandwidth TM01 wave mode that is combined with low frequency TM00 and HE11 wave modes configured according to wave mode division multiplexing (WMDM) and frequency division multiplexing (FDM) schemes to restore losses in system bandwidth.
• Consider now an uninsulated conductor where the waveguide system had launched at step2564 a TM00 wave mode with a frequency band that starts at 10 GHz having a large bandwidth (e.g., 10 GHz). Suppose now that transmission medium propagating the 10 GHz TM00 wave mode is exposed to an obstruction such as water. As noted earlier, a high frequency TM00 wave mode on an insulated conductor is subject to a substantial amount of signal attenuation (e.g., 45 dB/M at 10 GHz—seeFIG. 25J) when a water film (or droplets) accumulates on the outer surface of the insulated conductor. Similar attenuations will be present for a 10 GHz (or greater) TM00 wave mode propagating on an “uninsulated” conductor. An environmentally exposed uninsulated conductor (e.g., aluminum), however, can have an oxide layer formed on the outer surface which can serve as a dielectric layer that supports wave modes other than TM00 (e.g., HE11 wave modes). It is further noted that at lower frequencies a TM00 wave mode propagating on an insulated conductor exhibits a much lower attenuation (e.g., 0.62 dB/M at 4 GHz—seeFIG. 25J). A TM00 wave mode operating at less than 6 GHz would similarly exhibit low propagation losses on an uninsulated conductor. Accordingly, to mitigate the loss in bandwidth, the waveguide system can be configured to launch electromagnetic waves having a TM00 wave mode at lower frequencies (e.g., 6 GHz or less) and electromagnetic waves having an HE11 wave mode configured for WMDM and FDM at higher frequencies.
• Referring back toFIG. 25Y, suppose then that the waveguide system detects an obstruction such as water atstep2566 on an environmentally exposed uninsulated conductor. A waveguide system can be configured to mitigate the obstruction by transmitting a first electromagnetic wave configured with a TM00 wave mode having a center frequency at 2.75 GHz. Assuming a useable frequency band from 500 MHz to 5.5 GHz to convey communication signals, the electromagnetic waves can provide 5 GHz of system bandwidth.
• FIG. 25AF provides an illustration of an electric field plot of an HE11 wave mode at 200 GHz on a bare conductor with a thin aluminum oxide layer (4 um). The plot indicates the magnitude of the field strength of the rho-field, z-field, and phi-field components, at a point in time when they are at their peak, as a function of radial distance away from the center of a bare conductor. While the field strengths were calculated based on a condition where no water is present, the z-field and phi-field components of the electric fields can have a field strength that is extremely small relative to the magnitude of the radial rho-field beginning from the outer surface of the oxide layer and through the position that would be occupied by the water film as shown inFIG. 25AF.
• Assuming an oxide layer or other dielectric layer comparable to the size in the plot ofFIG. 25AF, the waveguide system can be configured to transmit a second electromagnetic wave having an HE11 wave mode with horizontal polarization, and a third electromagnetic wave having an HE11 wave mode with vertical polarization, each electromagnetic wave having a center frequency at 200 GHz (other lower or higher center frequencies can be used). Further assuming each electromagnetic wave is configured according to an HE vertically polarized wave mode and HE horizontally polarized wave mode, respectively, having a 2.5 GHz bandwidth, these waves collectively provide 5 GHz of additional bandwidth. By combining the low frequency TM00 wave mode with the high frequency HE wave modes, system bandwidth can be restored to 10 GHz. It will be appreciated that HE wave modes at other center frequencies and bandwidth may be possible depending on the thickness of the oxide layer, the characteristics of the uninsulated conductor, and/or other environmental factors.
• FIG. 25AE illustrates a process for performing mitigation of a high frequency TM00 wave mode subject to an obstruction such as a water film detected atstep2566.FIG. 25AD illustrates a transition from a dry uninsulated conductor that supports a high bandwidth TM00 wave mode to a wet uninsulated conductor that combines a low frequency TM00 wave mode and high frequency HE11 wave modes configured according to WMDM and FDM schemes to restore losses in system bandwidth.
• It will be appreciated that the aforementioned mitigation techniques are non-limiting. For example, the center frequencies described above can differ between systems. Additionally, the original wave mode used before an obstruction is detected can differ from the illustrations above. For example, in the case of an insulated conductor an EH11 wave mode can be used singly or in combination with a TM01 wave mode. It is also appreciated that WMDM and FDM techniques can be used to transmit electromagnetic waves at all times and not just when an obstruction is detected atstep2566. It is further appreciated that other wave modes that can support WMDM and/or FDM techniques can be applied to and/or combined with the embodiments described in the subject disclosure, and are therefore contemplated by the subject disclosure.
• Referring back toFIG. 25Y, once a mitigation scheme using WMDM and/or FDM has been determined in accordance with the above illustrations, the waveguide system can be configured atstep2568 to notify one or more other waveguide systems of the mitigation scheme intended to be used for updating one or more electromagnetic waves prior to executing the update atstep2570. The notification can be sent wirelessly to one or more other waveguide systems utilizing antennas if signal degradation in the electromagnetic waves is too severe. If signal attenuation is tolerable, then the notification can be sent via the affected electromagnetic waves. In other embodiments, the waveguide system can be configured to skipstep2568 and perform the mitigation scheme using WMDM and/or FDM atstep2570 without notification. This embodiment can be applied in cases where, for example, other recipient waveguide system(s) know beforehand what kind of mitigation scheme would be used, or the recipient waveguide system(s) are configured to use signal detection techniques to discover the mitigation scheme. Once the mitigation scheme using WMDM and/or FDM has been initiated atstep2570, the waveguide system can continue to process received communication signals atsteps2562 and2564 as described earlier using the updated configuration of the electromagnetic waves.
• Atstep2566, the waveguide system can monitor if the obstruction is still present. This determination can be performed by sending test signals (e.g., electromagnetic surface waves in the original wave mode) to other waveguide system(s) and awaiting test results back from the waveguide systems if the situation has improved, and/or by using other obstruction detection techniques such as signal reflection testing based on the sent test signals. Once the obstruction is determined to have been removed (e.g., the transmission medium becomes dry), the waveguide system can proceed to step2572 and determine that a signal update was performed atstep2568 using WMDM and/or FDM as a mitigation technique. The waveguide system can then be configured to notify recipient waveguide system(s) atstep2568 of the intent to restore transmissions to the original wave mode, or bypass this step and proceed to step2570 where it restores transmissions to an original wave mode and assumes the recipient waveguide system(s) know the original wave modes and corresponding transmission parameters, or can otherwise detect this change.
• A waveguide system can also be adapted to receive electromagnetic waves configured for WMDM and/or FDM. For example, suppose that an electromagnetic wave having a high bandwidth (e.g., 10 GHz) TM01 wave mode is propagating on an insulated conductor as shown inFIG. 25AD and that the electromagnetic wave is generated by a source waveguide system. Atstep2582, a recipient waveguide system can be configured to process the single electromagnetic wave with the TM01 wave mode under normal condition. Suppose, however, that the source waveguide system transitions to transmitting electromagnetic waves using WMDM and FDM along with a TM01 wave mode with a lower bandwidth on the insulated conductor, as previously described inFIG. 25AD. In this instance, the recipient waveguide system would have to process multiple electromagnetic waves of different wave modes. Specifically, the recipient waveguide system would be configured atstep2582 to selectively process each of the first through ninth electromagnetic waves using WMDM and FDM and the electromagnetic wave using the TM01 wave mode as shown inFIG. 25AD.
• Once the one or more electromagnetic waves have been received atstep2582, the recipient waveguide can be configured to use signal processing techniques to obtain the communication signals that were conveyed by the electromagnetic wave(s) generated by the source waveguide system at step2564 (and/orstep2570 if an update has occurred). Atstep2586, the recipient waveguide system can also determine if the source waveguide system has updated the transmission scheme. The update can be detected from data provided in the electromagnetic waves transmitted by the source waveguide system, or from wireless signals transmitted by the source waveguide system. If there are no updates, the recipient waveguide system can continue to receive and process electromagnetic waves atsteps2582 and2584 as described before. If, however, an update is detected atstep2586, the recipient waveguide system can proceed to step2588 to coordinate the update with the source waveguide system and thereafter receive and process updated electromagnetic waves atsteps2582 and2584 as described before.
• It will be appreciated that method2560 can be used in any communication scheme including simplex and duplex communications between waveguide systems. Accordingly, a source waveguide system that performs an update for transmitting electromagnetic waves according to other wave modes will in turn cause a recipient waveguide system to perform similar steps for return electromagnetic wave transmissions. It will also be appreciated that the aforementioned embodiments associated with method2560 ofFIG. 25Y and the embodiments shown inFIGS. 25Z through 25AE can be combined in whole or in part with other embodiments of the subject disclosure for purposes of mitigating propagation losses caused by an obstruction at or in a vicinity of an outer surface of a transmission medium (e.g., insulated conductor, uninsulated conductor, or any transmission medium having an external dielectric layer). The obstruction can be a liquid (e.g., water), a solid object disposed on the outer surface of the transmission medium (e.g., ice, snow, a splice, a tree limb, etc.), or any other objects located at or near the outer surface of the transmission medium.
• While for purposes of simplicity of explanation, the respective processes are shown and described as a series of blocks inFIG. 25Y, it is to be understood and appreciated that the claimed subject matter is not limited by the order of the blocks, as some blocks may occur in different orders and/or concurrently with other blocks from what is depicted and described herein. Moreover, not all illustrated blocks may be required to implement the methods described herein.
• Referring now toFIGS. 25AG and 25AH, block diagrams illustrating example, non-limiting embodiments for transmitting orthogonal wave modes according to the method2560 ofFIG. 25Y are shown.FIG. 25AG depicts an embodiment for simultaneously transmitting a TM00 wave mode, an HE11 wave mode with vertical polarization, and an HE11 wave mode with horizontal polarization as depicted in an instance in time inFIG. 25Z. In one embodiment, these orthogonal wave modes can be transmitted with a waveguide launcher having eight (8) MMICs as shown inFIG. 18 located at symmetrical locations (e.g., north, northeast, east, southeast, south, southwest, west, and northwest). The waveguide launcher ofFIG. 18R (orFIG. 18T) can be configured with these 8 MMICs. Additionally, the waveguide launcher can be configured with acylindrical sleeve2523A and tapered dielectric that wraps around the transmission medium (e.g., insulated conductor, uninsulated conductor, or other cable with a dielectric layer such as dielectric core). The housing assembly of the waveguide launcher (not shown) can be configured to include a mechanism (e.g., a hinge) to enable a longitudinal opening of the waveguide launcher for placement and latching around a circumference of a transmission medium.
• With these configurations in mind, the waveguide launcher can include three transmitters (TX1, TX2, and TX3) coupled to MMICs having various coordinate positions (seeFIG. 25AG andFIG. 18W). The interconnectivity between the transmitters (TX1, TX2, and TX3) and the MMICs can be implemented with a common printed circuit board or other suitable interconnecting technology. The first transmitter (TX1) can be configured to launch a TM00 wave mode, the second transmitter (TX2) can be configured to launch an HE11 vertical polarization wave mode, and the third transmitter (TX3) can be configured to launch an HE11 horizontal polarization wave mode.
• A first signal port (shown as “SP1”) of the first transmitter (TX1) can be coupled in parallel to each of the 8 MMICs. A second signal port (shown as “SP2”) of the first transmitter (TX1) can be coupled to aconductive sleeve2523A that is placed on the transmission medium by the waveguide launcher as noted above. The first transmitter (TX1) can be configured to receive a first group of the communication signals described instep2562 ofFIG. 25Y. The first group of communication signals can be frequency-shifted by the first transmitter (TX1) from their native frequencies (if necessary) for an orderly placement of the communication signals in channels of a first electromagnetic wave configured according to the TM00 wave mode. The 8 MMICs coupled to the first transmitter (TX1) can be configured to up-convert (or down-convert) the first group of the communication signals to the same center frequency (e.g., 1 GHz for the first electromagnetic wave as described in relation toFIG. 25AD). All 8 MMICs would have synchronized reference oscillators that can be phase locked using various synchronization techniques.
• Since the 8 MMICs receive signals from the first signal port of the first transmitter (TX1) based on the reference provided by the second signal port, the 8 MMICs thereby receive signals with the same polarity. Consequently, once these signals have been up-converted (or down-converted) and processed for transmission by the 8 MMICs, one or more antennas of each of the 8 MMICs simultaneously radiates signals with electric fields of the same polarity. Collectively, MMICs that are opposite in location to each other (e.g., MMIC north and MMIC south) will have an electric field structure aligned towards or away from the transmission medium, thereby creating at a certain instance in time an outward field structure like the TM00 wave mode shown inFIG. 25Z. Due to the constant oscillatory nature of the signals radiated by the 8 MMICs, it will be appreciated that at other instances in time, the field structure shown inFIG. 25Z will radiate inward. By symmetrically radiating electric fields with the same polarity the collection of opposing MMICs contribute to the inducement of a first electromagnetic wave having a TM00 wave mode that propagates on a transmission medium with a dielectric layer and can convey the first group of the communication signals to a receiving waveguide system.
• Turning now to the second transmitter (TX2) inFIG. 25AG, this transmitter has a first signal port (SP1) coupled to MMICs located in north, northeast and northwest positions, while a second signal port (SP2) of the second transmitter (TX2) is coupled to the MMICs located in south, southeast and southwest positions (seeFIG. 18W). The second transmitter (TX2) can be configured to receive a second group of the communication signals described instep2562 ofFIG. 25Y, which differs from the first group of the communication signals received by the first transmitter (TX1). The second group of communication signals can be frequency-shifted by the second transmitter (TX2) from their native frequencies (if necessary) for an orderly placement of the communication signals in channels of a second electromagnetic wave configured according to an HE11 wave mode with vertical polarization. The 6 MMICs coupled to the second transmitter (TX2) can be configured to up-convert (or down-conversion) the second group of the communication signals to the same center frequency as used for the TM00 wave mode (i.e., 1 GHz as described in relation toFIG. 25AD). Since a TM00 wave mode is orthogonal to an HE11 wave mode with vertical polarization, they can share the same center frequency in an overlapping frequency band without interference.
• Referring back toFIG. 25AG, the first signal port (SP1) of the second transmitter (TX2) generates signals of opposite polarity to the signals of the second signal port (SP2). As a result, the electric field alignment of signals generated by one or more antennas of the northern MMIC will be of opposite polarity to the electric field alignment of signals generated by one or more antennas of the southern MMIC. Consequently, the electric fields of the north and south MMICs will have an electric field structure that is vertically aligned in the same direction, thereby creating at a certain instance in time a northern field structure like the HE11 wave mode with vertical polarization shown inFIG. 25Z. Due to the constant oscillatory nature of the signals radiated by the north and south MMICs, it will be appreciated that at other instances in time, the HE11 wave mode will have a southern field structure. Similarly, based on the opposite polarity of signals supplied to the northeast and southeast MMICs by the first and second signal ports, respectively, these MMICs will generate at a certain instance in time the curved electric field structure shown on the east side of the HE11 wave mode with vertical polarization depicted inFIG. 25Z. Also, based on the opposite polarity of signals supplied to the northwest and southwest MMICs, these MMICs will generate at a certain instance in time the curved electric field structure shown on the west side of the HE11 wave mode with vertical polarization depicted inFIG. 25Z.
• By radiating electric fields with opposite polarity by opposing MMICs (north, northeast and northwest versus south, southeast and southwest), the collection of signals with a directionally aligned field structure contribute to the inducement of a second electromagnetic wave having the HE11 wave mode with vertical polarization shown inFIG. 25Z. The second electromagnetic wave propagates along the “same” transmission medium as previously described for the first transmitter (TX1). Given the orthogonality of a TM00 wave mode and an HE11 wave mode with vertical polarization, there will be ideally no interference between the first electromagnetic wave and the second electromagnetic wave. Consequently, the first and second electromagnetic waves having overlapping frequency bands propagating along the same transmission medium can successfully convey the first and second groups of the communication signals to the same (or other) receiving waveguide system.
• Turning now to the third transmitter (TX3) inFIG. 25AG, this transmitter has a first signal port (SP1) coupled to MMICs located in east, northeast and southeast positions, while a second signal port (SP2) of the third transmitter (TX3) is coupled to the MMICs located in west, northwest and southwest positions (seeFIG. 18W). The third transmitter (TX3) can be configured to receive a third group of the communication signals described instep2562 ofFIG. 25Y, which differs from the first and second groups of the communication signals received by the first transmitter (TX1) and the second transmitter (TX2), respectively. The third group of communication signals can be frequency-shifted by the third transmitter (TX3) from their native frequencies (if necessary) for an orderly placement of the communication signals in channels of a second electromagnetic wave configured according to an HE11 wave mode with horizontal polarization. The 6 MMICs coupled to the third transmitter (TX3) can be configured to up-convert (or down-conversion) the third group of the communication signals to the same center frequency as used for the TM00 wave mode and HE11 wave mode with vertical polarization (i.e., 1 GHz as described in relation toFIG. 25AD). Since a TM00 wave mode, an HE11 wave mode with vertical polarization, and an HE11 wave mode with horizontal polarization are orthogonal, they can share the same center frequency in an overlapping frequency band without interference.
• Referring back toFIG. 25AG, the first signal port (SP1) of the third transmitter (TX3) generates signals of opposite polarity to the signals of the second signal port (SP2). As a result, the electric field alignment of signals generated by one or more antennas of the eastern MMIC will be of opposite polarity to the electric field alignment of signals generated by one or more antennas of the western MMIC. Consequently, the electric fields of the east and west MMICs will have an electric field structure that is horizontally aligned in the same direction, thereby creating at a certain instance in time a western field structure like the HE11 wave mode with horizontal polarization shown inFIG. 25Z. Due to the constant oscillatory nature of the signals radiated by the east and west MMICs, it will be appreciated that at other instances in time, the HE wave mode will have an eastern field structure. Similarly, based on the opposite polarity of signals supplied to the northeast and northwest MMICs by the first and second signal ports, respectively, these MMICs will generate at a certain instance in time the curved electric field structure shown on the north side of the HE11 wave mode with horizontal polarization depicted inFIG. 25Z. Also, based on the opposite polarity of signals supplied to the southeast and southwest MMICs, these MMICs will generate at a certain instance in time the curved electric field structure shown on the south side of the HE wave mode with horizontal polarization depicted inFIG. 25Z.
• By radiating electric fields with opposite polarity by opposing MMICs (east, northeast and southeast versus west, northwest and southwest), the collection of signals with a directionally aligned field structure contribute to the inducement of a third electromagnetic wave having the HE wave mode with horizontal polarization shown inFIG. 25Z. The third electromagnetic wave propagates along the “same” transmission medium as previously described for the first transmitter (TX1) and the second transmitter (TX2). Given the orthogonality of a TM00 wave mode, an HE11 wave mode with vertical polarization, and an HE wave mode with horizontal polarization, there will be, ideally, no interference between the first electromagnetic wave, the second electromagnetic wave, and the third electromagnetic wave. Consequently, the first, second and third electromagnetic waves having overlapping frequency bands propagating along the same transmission medium can successfully convey the first, second and third groups of the communication signal to the same (or other) receiving waveguide system.
• Because of the orthogonality of the electromagnetic waves described above, a recipient waveguide system can be configured to selectively retrieve the first electromagnetic wave having the TM00 wave mode, the second electromagnetic wave having the HE11 wave mode with vertical polarization, and the third electromagnetic wave having the HE11 wave mode with horizontal polarization. After processing each of these electromagnetic waves, the recipient waveguide system can be further configured to obtain the first, second and third group of the communication signals conveyed by these waves.FIG. 25AH illustrates a block diagram for selectively receiving each of the first, second and third electromagnetic waves.
• Specifically, the first electromagnetic wave having the TM00 wave mode can be selectively received by a first receiver (RX1) shown inFIG. 25AH by taking the difference between the signals received by all 8 MMICs and the signal reference provided by themetal sleeve2523A as depicted in the block diagram inFIG. 25AI. The second electromagnetic wave having the HE11 wave mode with vertical polarization can be selectively received by a second receiver (RX2) shown inFIG. 25AH by taking the difference between the signals received by the MMICs located in north, northeast and northwest positions and the signals received by the MMICs located in south, southeast and southwest positions as depicted in the block diagram inFIG. 25AJ. The third electromagnetic wave having the HE11 wave mode with horizontal polarization can be selectively received by a third receiver (RX3) shown inFIG. 25AH by taking the difference between the signals received by the MMICs located in east, northeast and southeast positions and the signals received by the MMICs located in west, northwest and southwest positions as depicted in the block diagram inFIG. 25AK.
• FIG. 25AL illustrates a simplified functional block diagram of an MMIC. The MMIC can, for example, utilize a mixer coupled to a reference (TX) oscillator that shifts one of the communication signals supplied by one of the signal ports (SP1 or SP2) of one of the transmitters (TX1, TX2 or TX3) to a desired center frequency in accordance with the configurations shown inFIG. 25AG. For example, in the case ofTX1, the communication signal from SP1 is supplied to a transmit path of each of the MMICs (i.e., NE, NW, SE, SW, N, S, E, and W). In the case of TX2, the communication signal from SP1 is supplied to another transmit path of three MMICs (i.e., N, E, and NW). Note the transmit paths used by MMICs N, E and W for the communication signal supplied by SP1 of TX2 are different from the transmit paths used by the MMICs for the communication signal supplied by SP1 of TX1. Similarly, the communication signal from SP2 of TX2 is supplied to another transmit path of three other MMICs (i.e., S, SE, and SW). Again, the transmit paths used by MMICs S, SE and SW for the communication signal supplied by SP2 of TX2 are different from the transmit paths used by the MMICs for the communication signals from SP1 of TX1, and SP1 of TX2. Lastly, in the case of TX3, the communication signal from SP1 is supplied to yet another transmit path of three MMICs (i.e., E, NE, and SE). Note the transmit paths used for MMICs E, NE, and SE for the communication signal from SP1 of TX3 are different from the transmit paths used by the MMICs for the communication signals supplied by SP1 of TX1, SP1 of TX2, and SP2 of TX2. Similarly, the communication signal from SP2 of TX3 is supplied to another transmit path of three other MMICs (i.e., W, NW, and SW). Again, the transmit paths used by MMICs W, NW, and SW for the communication signal supplied by SP2 of TX3 are different from the transmit paths used by the MMICs for the communication signals from SP1 of TX1, SP1 of TX2, and SP2 of TX2, and SP1 of TX3.
• Once the communication signals have been frequency-shifted by the mixer shown in the transmit path, the frequency-shifted signal generated by the mixer can then be filtered by a bandpass filter that removes spurious signals. The output of the bandpass filter in turn can be provided to a power amplifier that couples to an antenna by way of a duplexer for radiating signals in the manner previously described. The duplexer can be used to isolate a transmit path from a receive path. The illustration ofFIG. 25AL is intentionally oversimplified to enable ease of illustration.
• It will be appreciated that other components (not shown) such as an impedance matching circuit, phase lock loop, or other suitable components for improving the accuracy and efficiency of the transmission path (and receive path) is contemplated by the subject disclosure. Furthermore, while a single antenna can be implemented by each MMIC, other designs with multiple antennas can likewise be employed. It is further appreciated that to achieve more than one orthogonal wave mode with overlapping frequency bands (e.g., TM00, HE11 Vertical, and HE11 Horizontal wave modes described above), the transmit path can be repeated N times using the same reference oscillator. N can represent an integer associated with the number of instances the MMIC is used to generate each of the wave modes. For example, inFIG. 25AG, MMIC NE is used three times; hence, MMIC NE has three transmit paths (N=3), MMIC NW is used three times; hence, MMIC NW has three transmit paths (N=3), MMIC N is used twice; hence, MMIC N has two transmit paths (N=2), and so on. If frequency division multiplexing is employed to generate the same wave modes in other frequency band(s) (seeFIGS. 25AD and 25AE), the transmit path can be further repeated using different reference oscillator(s) that are centered at the other frequency band(s).
• In the receive path shown inFIG. 25AL, N signals supplied by N antennas via the duplexer of each transmit path in the MMIC can be filtered by a corresponding N bandpass filters, which supply their output to N low-noise amplifiers. The N low-noise amplifiers in turn supply their signals to N mixers to generate N intermediate-frequency received signals. As before, N is representative of the number of instances the MMIC is used for receiving wireless signals for different wave modes. For example, inFIG. 25AH, MMIC NE is used in three instances; hence, MMIC NE has three receive paths (N=3), MMIC N is used in two instances; hence, MMIC N has two receive paths (N=2), and so on.
• Referring back toFIG. 25AL, to reconstruct a wave mode signal, Y received signals supplied by receiver paths of certain MMICs (or a reference from themetal sleeve2523A ofFIG. 25D) is subtracted from X received signals supplied by other MMICs based on the configurations shown inFIGS. 25AI-25AK. For example, a TM00 signal is reconstructed by supplying the received signals of all MMICs (NE, NW, SE, SW, N, S, E, W) to the plus port of the summer (i.e., X signals), while the reference signal from themetal sleeve2523A ofFIG. 25D is supplied to the negative port of the summer (i.e., Y signal)—seeFIG. 25AI. The difference between the X and Y signals results in the TM00 signal. To reconstruct the HE11 Vertical signal, the received signals of MMICs N, NE, and NW are supplied to the plus port of the summer (i.e., X signals), while the received signals of MMICs S, SE, and SW are supplied to the negative port of the summer (i.e., Y signals)—seeFIG. 25AJ. The difference between the X and Y signals results in the HE11 vertical signal. Lastly, to reconstruct the HE11 Horizontal signal, the received signals of MMICs E, NE, and SE are supplied to the plus port of the summer (i.e., X signals), while the received signals of MMICs W, NW, and SW are supplied to the negative port of the summer (i.e., Y signals)—seeFIG. 25AK. The difference between the X and Y signals results in the HE11 horizontal signal. Since there are three wave mode signals being reconstructed, the block diagram of the summer with the X and Y signals is repeated three times.
• Each of these reconstructed signals is at intermediate frequencies. These intermediate-frequency signals are provided to receivers (RX1, RX2 and RX3) which include circuitry (e.g., a DSP, A/D converter, etc.) for processing and to selectively obtain communication signals therefrom. Similar to the transmit paths, the reference oscillators of the three receiver paths can be configured to be synchronized with phase lock loop technology or other suitable synchronization technique. If frequency division multiplexing is employed for the same wave modes in other frequency band(s) (seeFIGS. 25AD and 25AE), the receiver paths can be further repeated using a different reference oscillator that is centered at the other frequency band(s).
• It will be appreciated that other suitable designs that can serve as alternative embodiments to those shown inFIGS. 25AG-25AL can be used for transmitting and receiving orthogonal wave modes. For example, there can be fewer or more MMICs than described above. In place of the MMICs, or in combination, slotted launchers as shown inFIGS. 18N-18O, 18Q, 18S, 18U and 18V can be used. It is further appreciated that more or fewer sophisticated functional components can be used for transmitting or receiving orthogonal wave modes. Accordingly, other suitable designs and/or functional components are contemplated by the subject disclosure for transmitting and receiving orthogonal wave modes.
• FIGS. 25AM and 25AN are block diagrams illustrating example, non-limiting embodiments of transmission media for propagating electromagnetic waves in accordance with various aspects described herein.FIG. 25AM depicts amulti-stranded conductor2590 having acorrugated surface2591. An uninsulated conductor having an outer surface that has a non-uniform physical structure can serve as a substitute for a dielectric loading. That is, the non-uniform physical structure of an uninsulated conductor can serve as a pseudo dielectric layer which enables propagation of electromagnetic waves of various fundamental and/or non-fundamental wave modes. The pseudo dielectric layer in this illustration originates from the non-uniform physical structure of the uninsulated conductor, which acts as a dielectric layer but is not composed of any dielectric material. For example, thecorrugated surface2591 of themulti-stranded conductor2590 can serve as a substitute for a dielectric loading. The launchers or couplers described by the subject disclosure can be configured to induce electromagnetic waves having a non-fundamental wave mode (i.e., a wave mode other than TM00) that propagate along an uninsulated conductor having a non-uniform, irregular, and/or non-smooth outer physical structure that provides a dielectric load for propagating electromagnetic waves. In other embodiments, the launchers or couplers described by the subject disclosure can be configured to receive and process electromagnetic waves having a non-fundamental wave mode (i.e., a wave mode other than TM00) that propagate along an uninsulated conductor having a non-uniform, irregular, and/or non-smooth outer physical structure. It will be further appreciated that the launchers or couplers of the subject disclosure can also be configured to transmit or receive electromagnetic waves having a fundamental wave mode (TM00) that propagate along an uninsulated conductor having a non-uniform, irregular, and/or non-smooth outer physical structure.
• In some embodiments, a non-uniform, irregular, and/or non-smooth outer physical structure of an uninsulated conductor can be formed environmentally due to oxidation of the uninsulated conductor. In other embodiments, a process of manufacture of the uninsulated conductor (e.g., forming a multi-threaded helix conductor) can result in a non-uniform, irregular, and/or non-smooth outer physical structure of an uninsulated conductor, which can serve as a dielectric loading. In yet other embodiments, a non-uniform, irregular, and/or non-smooth outer physical structure of an uninsulated conductor can be formed from a combination of environmental effects on the uninsulated conductor and a process of manufacture of the uninsulated conductor.
• It will be appreciated that an oxidation layer formed on an outer surface of an uninsulated conductor can have dielectric properties. Since the uninsulated conductor is manufactured without an insulation layer (or other dielectric material), an environmentally formed oxidation layer also serves as a pseudo dielectric layer that enables the propagation of electromagnetic waves of fundamental and/or non-fundamental wave modes. A combination of an oxidation layer and a non-uniform, irregular, and/or non-smooth outer physical structure of an uninsulated conductor can serve as an enhanced pseudo dielectric layer enabling the propagation of electromagnetic waves of fundamental and/or non-fundamental wave modes.
• FIG. 25AN depicts acable2592 with amaterial2593 disposed on an outer surface of thecable2592. Thecable2592 can be an insulated conductor or an uninsulated conductor. In one embodiment, thematerial2593 can be water accumulated on thecable2592 as a result of rain and/or humidity. In other embodiments, the material can be an accumulation of other environmental materials (e.g., material carried by rain water and/or humidity deposited on an outer surface of the cable over long periods of time, dust, or other foreign matter). In some embodiments, thematerial2593 can be uniformly formed throughout the outer surface of thecable2592. In other embodiments, thematerial2593 can be formed only on some areas of the outer surface of the cable2592 (e.g., a top surface, or bottom surface of the cable2592). In some instances thematerial2593 can have dielectric properties thereby forming a pseudo dielectric layer that enables thecable2592 to serve as a substitute for a dielectric loading. In such instances, the launchers or couplers described by the subject disclosure can be configured to induce electromagnetic waves having a non-fundamental wave mode (i.e., a wave mode other than TM00) that propagate along thematerial2593 disposed on an outer surface ofcable2592. In other embodiments, the launchers or couplers described by the subject disclosure can be configured to receive electromagnetic waves having a non-fundamental wave mode (i.e., a wave mode other than TM00) that propagate along thematerial2593 disposed on an outer surface ofcable2592. It will be further appreciated that the launchers or couplers of the subject disclosure can also be configured to transmit or receive electromagnetic waves having a fundamental wave mode (TM00) that propagate along an uninsulated conductor having a non-uniform, irregular, and/or non-smooth outer physical structure.
• When a foreign material is disposed on an outer surface of thecable2592, the launchers or couplers of the subject disclosure can be configured to detect its presence and can be further configured to switch from one wave mode (e.g., TM00) to another wave mode (e.g., hybrid wave mode) to take advantage of the dielectric properties of a pseudo dielectric layer formed by thematerial2593. The detection of thematerial2593 can be based on image detection obtained from an imaging device (e.g., a camera) used by the launcher or coupler. Alternatively, detection of thematerial2593 can result from the launcher or coupler exchanging test electromagnetic waves having one or more non-fundamental wave modes with another launcher or coupler located at another section of thecable2592. If the launchers or couplers at both locations of acable2592 were unable to receive electromagnetic waves with one or more non-fundamental wave modes from each other at a prior time, but at a later time are able to exchange electromagnetic waves with one or more non-fundamental wave modes, then the launchers or couplers can reach the conclusion that amaterial2593 having dielectric properties is now disposed on the outer surface of thecable2592. From this detection, the launchers or couplers can be reconfigured to take advantage of exchanging electromagnetic waves having non-fundamental wave modes.
• Based on the foregoing illustrations, a pseudo dielectric layer can be formed from a physical structure of a bare conductor manufactured without a dielectric material disposed on an outer surface of the bare conductor, an environmentally formed material on the outer surface of the bare conductor having dielectric properties, or combinations thereof.
• FIG. 25AO illustrates a flow diagram of, an example, non-limiting embodiment of amethod2594 for transmitting electromagnetic waves in accordance with various aspects described herein.Method2594 can begin withstep2595 where a transmitting device receives communication signals. The communication signals can be a voice signal, a video streaming signal, internet traffic signals, other communication signals, or any combinations thereof. The communication signals can be baseband signals or signals that have been modulated according to a select signaling protocol (e.g., LTE) operating at a particular frequency band (e.g., 1.9 GHz LTE signal). Atstep2596, the transmitting device can be configured to generate, according the communication signals, a plurality of wireless signals that induces electromagnetic waves that propagate along a dielectric (layer from a non-uniform physical structure of a transmission medium and/or from a material that has accumulated on the transmission medium. The electromagnetic waves can have a fundamental wave mode, a non-fundamental wave mode, or a combination thereof. The electromagnetic waves can be directed to one or more receiving devices coupled to the transmission medium. The electromagnetic waves can convey in whole or in part the communications signals. The transmitting device can also be configured to select at least one MIMO technique to generate the electromagnetic wave transmissions. Additionally, the transmitting device can be configured to frequency shift the communication signals to a suitable frequency band without modifying the signaling protocol of the communication signals. The transmitting device can also be configured to transmit a reference signal with the electromagnetic waves to enable one or more receiving devices to mitigate signal distortion (e.g., phase error). The reference signal can also be modulated to include control channel instructions directed to the one or more receiving devices. The reference signal can also be accompanied by a clock signal for providing the one or more receiving devices synchronization data.
• Although not shown inFIG. 25AO, the transmitting and receiving devices can be configured to detect the pseudo dielectric layer and modify a wave mode of the electromagnetic waves responsive to such detection. Similarly, the transmitting and receiving devices can be configured to detect a dissipation or removal of the pseudo dielectric layer and modify a wave mode of the electromagnetic waves responsive to such detection.
• FIG. 25AP illustrates a flow diagram of, an example, non-limiting embodiment of amethod2597 for receiving electromagnetic waves in accordance with various aspects described herein.Method2597 can begin withstep2598 where each receiving device can be configured to receive and process one or more electromagnetic waves having a fundamental wave mode, a non-fundamental wave mode, or a combination thereof generated by the transmitting device at a remote location that propagate along a pseudo dielectric layer of the transmission medium. Each receiving device can use at least one MIMO technique to process the electromagnetic waves and thereby extract atstep2599 at least one of the communication signals conveyed by the electromagnetic waves. The extraction process can include signal amplification, frequency-shifting, and filtering, among other things. In addition, each receiving device can use a reference signal included in the electromagnetic waves to mitigate signal distortion, can use a clock signal (if present) for synchronization, and can obtain control channel instructions if the reference signal is modulated with such instructions. The control channel instructions can be used, for example, to determine which communication signals are to be distributed wirelessly to local communication devices (e.g., mobile phones or other communication devices), and which communication signals are to be retransmitted to one or more other receiving devices using the techniques described above for the transmitting device(s).
• While for purposes of simplicity of explanation, the respective processes are shown and described as a series of blocks inFIGS. 25AO and 25AP, respectively, it is to be understood and appreciated that the claimed subject matter is not limited by the order of the blocks, as some blocks may occur in different orders and/or concurrently with other blocks from what is depicted and described herein. Moreover, not all illustrated blocks may be required to implement the methods described herein.
• Referring now toFIG. 26, there is illustrated a block diagram of a computing environment in accordance with various aspects described herein. In order to provide additional context for various embodiments of the embodiments described herein,FIG. 26 and the following discussion are intended to provide a brief, general description of asuitable computing environment2600 in which the various embodiments of the subject disclosure can be implemented. While the embodiments have been described above in the general context of computer-executable instructions that can run on one or more computers, those skilled in the art will recognize that the embodiments can be also implemented in combination with other program modules and/or as a combination of hardware and software.
• Generally, program modules comprise routines, programs, components, data structures, etc., that perform particular tasks or implement particular abstract data types. Moreover, those skilled in the art will appreciate that the inventive methods can be practiced with other computer system configurations, comprising single-processor or multiprocessor computer systems, minicomputers, mainframe computers, as well as personal computers, hand-held computing devices, microprocessor-based or programmable consumer electronics, and the like, each of which can be operatively coupled to one or more associated devices.
• As used herein, a processing circuit includes processor as well as other application specific circuits such as an application specific integrated circuit, digital logic circuit, state machine, programmable gate array or other circuit that processes input signals or data and that produces output signals or data in response thereto. It should be noted that while any functions and features described herein in association with the operation of a processor could likewise be performed by a processing circuit.
• The terms “first,” “second,” “third,” and so forth, as used in the claims, unless otherwise clear by context, is for clarity only and doesn't otherwise indicate or imply any order in time. For instance, “a first determination,” “a second determination,” and “a third determination,” does not indicate or imply that the first determination is to be made before the second determination, or vice versa, etc.
• The illustrated embodiments of the embodiments herein can be also practiced in distributed computing environments where certain tasks are performed by remote processing devices that are linked through a communications network. In a distributed computing environment, program modules can be located in both local and remote memory storage devices.
• Computing devices typically comprise a variety of media, which can comprise computer-readable storage media and/or communications media, which two terms are used herein differently from one another as follows. Computer-readable storage media can be any available storage media that can be accessed by the computer and comprises both volatile and nonvolatile media, removable and non-removable media. By way of example, and not limitation, computer-readable storage media can be implemented in connection with any method or technology for storage of information such as computer-readable instructions, program modules, structured data or unstructured data.
• Computer-readable storage media can comprise, but are not limited to, random access memory (RAM), read only memory (ROM), electrically erasable programmable read only memory (EEPROM), flash memory or other memory technology, compact disk read only memory (CD-ROM), digital versatile disk (DVD) or other optical disk storage, magnetic cassettes, magnetic tape, magnetic disk storage or other magnetic storage devices or other tangible and/or non-transitory media which can be used to store desired information. In this regard, the terms “tangible” or “non-transitory” herein as applied to storage, memory or computer-readable media, are to be understood to exclude only propagating transitory signals per se as modifiers and do not relinquish rights to all standard storage, memory or computer-readable media that are not only propagating transitory signals per se.
• Computer-readable storage media can be accessed by one or more local or remote computing devices, e.g., via access requests, queries or other data retrieval protocols, for a variety of operations with respect to the information stored by the medium.
• Communications media typically embody computer-readable instructions, data structures, program modules or other structured or unstructured data in a data signal such as a modulated data signal, e.g., a carrier wave or other transport mechanism, and comprises any information delivery or transport media. The term “modulated data signal” or signals refers to a signal that has one or more of its characteristics set or changed in such a manner as to encode information in one or more signals. By way of example, and not limitation, communication media comprise wired media, such as a wired network or direct-wired connection, and wireless media such as acoustic, RF, infrared and other wireless media.
• With reference again toFIG. 26, theexample environment2600 for transmitting and receiving signals via or forming at least part of a base station (e.g.,base station devices1504,macrocell site1502, or base stations1614) or central office (e.g.,central office1501 or1611). At least a portion of theexample environment2600 can also be used fortransmission devices101 or102. The example environment can comprise acomputer2602, thecomputer2602 comprising aprocessing unit2604, asystem memory2606 and asystem bus2608. Thesystem bus2608 couple's system components including, but not limited to, thesystem memory2606 to theprocessing unit2604. Theprocessing unit2604 can be any of various commercially available processors. Dual microprocessors and other multiprocessor architectures can also be employed as theprocessing unit2604.
• Thesystem bus2608 can be any of several types of bus structure that can further interconnect to a memory bus (with or without a memory controller), a peripheral bus, and a local bus using any of a variety of commercially available bus architectures. Thesystem memory2606 comprisesROM2610 andRAM2612. A basic input/output system (BIOS) can be stored in a non-volatile memory such as ROM, erasable programmable read only memory (EPROM), EEPROM, which BIOS contains the basic routines that help to transfer information between elements within thecomputer2602, such as during startup. TheRAM2612 can also comprise a high-speed RAM such as static RAM for caching data.
• Thecomputer2602 further comprises an internal hard disk drive (HDD)2614 (e.g., EIDE, SATA), which internalhard disk drive2614 can also be configured for external use in a suitable chassis (not shown), a magnetic floppy disk drive (FDD)2616, (e.g., to read from or write to a removable diskette2618) and anoptical disk drive2620, (e.g., reading a CD-ROM disk2622 or, to read from or write to other high capacity optical media such as the DVD). Thehard disk drive2614,magnetic disk drive2616 andoptical disk drive2620 can be connected to thesystem bus2608 by a harddisk drive interface2624, a magneticdisk drive interface2626 and anoptical drive interface2628, respectively. Theinterface2624 for external drive implementations comprises at least one or both of Universal Serial Bus (USB) and Institute of Electrical and Electronics Engineers (IEEE) 1394 interface technologies. Other external drive connection technologies are within contemplation of the embodiments described herein.
• The drives and their associated computer-readable storage media provide nonvolatile storage of data, data structures, computer-executable instructions, and so forth. For thecomputer2602, the drives and storage media accommodate the storage of any data in a suitable digital format. Although the description of computer-readable storage media above refers to a hard disk drive (HDD), a removable magnetic diskette, and a removable optical media such as a CD or DVD, it should be appreciated by those skilled in the art that other types of storage media which are readable by a computer, such as zip drives, magnetic cassettes, flash memory cards, cartridges, and the like, can also be used in the example operating environment, and further, that any such storage media can contain computer-executable instructions for performing the methods described herein.
• A number of program modules can be stored in the drives andRAM2612, comprising anoperating system2630, one ormore application programs2632,other program modules2634 andprogram data2636. All or portions of the operating system, applications, modules, and/or data can also be cached in theRAM2612. The systems and methods described herein can be implemented utilizing various commercially available operating systems or combinations of operating systems. Examples ofapplication programs2632 that can be implemented and otherwise executed byprocessing unit2604 include the diversity selection determining performed bytransmission device101 or102.
• A user can enter commands and information into thecomputer2602 through one or more wired/wireless input devices, e.g., akeyboard2638 and a pointing device, such as amouse2640. Other input devices (not shown) can comprise a microphone, an infrared (IR) remote control, a joystick, a game pad, a stylus pen, touch screen or the like. These and other input devices are often connected to theprocessing unit2604 through aninput device interface2642 that can be coupled to thesystem bus2608, but can be connected by other interfaces, such as a parallel port, an IEEE 1394 serial port, a game port, a universal serial bus (USB) port, an IR interface, etc.
• Amonitor2644 or other type of display device can be also connected to thesystem bus2608 via an interface, such as avideo adapter2646. It will also be appreciated that in alternative embodiments, amonitor2644 can also be any display device (e.g., another computer having a display, a smart phone, a tablet computer, etc.) for receiving display information associated withcomputer2602 via any communication means, including via the Internet and cloud-based networks. In addition to themonitor2644, a computer typically comprises other peripheral output devices (not shown), such as speakers, printers, etc.
• Thecomputer2602 can operate in a networked environment using logical connections via wired and/or wireless communications to one or more remote computers, such as a remote computer(s)2648. The remote computer(s)2648 can be a workstation, a server computer, a router, a personal computer, portable computer, microprocessor-based entertainment appliance, a peer device or other common network node, and typically comprises many or all of the elements described relative to thecomputer2602, although, for purposes of brevity, only a memory/storage device2650 is illustrated. The logical connections depicted comprise wired/wireless connectivity to a local area network (LAN)2652 and/or larger networks, e.g., a wide area network (WAN)2654. Such LAN and WAN networking environments are commonplace in offices and companies, and facilitate enterprise-wide computer networks, such as intranets, all of which can connect to a global communications network, e.g., the Internet.
• When used in a LAN networking environment, thecomputer2602 can be connected to thelocal network2652 through a wired and/or wireless communication network interface oradapter2656. Theadapter2656 can facilitate wired or wireless communication to theLAN2652, which can also comprise a wireless AP disposed thereon for communicating with thewireless adapter2656.
• When used in a WAN networking environment, thecomputer2602 can comprise amodem2658 or can be connected to a communications server on theWAN2654 or has other means for establishing communications over theWAN2654, such as by way of the Internet. Themodem2658, which can be internal or external and a wired or wireless device, can be connected to thesystem bus2608 via theinput device interface2642. In a networked environment, program modules depicted relative to thecomputer2602 or portions thereof, can be stored in the remote memory/storage device2650. It will be appreciated that the network connections shown are example and other means of establishing a communications link between the computers can be used.
• Thecomputer2602 can be operable to communicate with any wireless devices or entities operatively disposed in wireless communication, e.g., a printer, scanner, desktop and/or portable computer, portable data assistant, communications satellite, any piece of equipment or location associated with a wirelessly detectable tag (e.g., a kiosk, news stand, restroom), and telephone. This can comprise Wireless Fidelity (Wi-Fi) and BLUETOOTH® wireless technologies. Thus, the communication can be a predefined structure as with a conventional network or simply an ad hoc communication between at least two devices.
• Wi-Fi can allow connection to the Internet from a couch at home, a bed in a hotel room or a conference room at work, without wires. Wi-Fi is a wireless technology similar to that used in a cell phone that enables such devices, e.g., computers, to send and receive data indoors and out; anywhere within the range of a base station. Wi-Fi networks use radio technologies called IEEE 802.11 (a, b, g, n, ac, ag etc.) to provide secure, reliable, fast wireless connectivity. A Wi-Fi network can be used to connect computers to each other, to the Internet, and to wired networks (which can use IEEE 802.3 or Ethernet). Wi-Fi networks operate in the unlicensed 2.4 and 5 GHz radio bands for example or with products that contain both bands (dual band), so the networks can provide real-world performance similar to the basic 10BaseT wired Ethernet networks used in many offices.
• FIG. 27 presents anexample embodiment2700 of amobile network platform2710 that can implement and exploit one or more aspects of the disclosed subject matter described herein. In one or more embodiments, themobile network platform2710 can generate and receive signals transmitted and received by base stations (e.g.,base station devices1504,macrocell site1502, or base stations1614), central office (e.g.,central office1501 or1611), ortransmission device101 or102 associated with the disclosed subject matter. Generally,wireless network platform2710 can comprise components, e.g., nodes, gateways, interfaces, servers, or disparate platforms, that facilitate both packet-switched (PS) (e.g., internet protocol (IP), frame relay, asynchronous transfer mode (ATM)) and circuit-switched (CS) traffic (e.g., voice and data), as well as control generation for networked wireless telecommunication. As a non-limiting example,wireless network platform2710 can be included in telecommunications carrier networks, and can be considered carrier-side components as discussed elsewhere herein.Mobile network platform2710 comprises CS gateway node(s)2722 which can interface CS traffic received from legacy networks like telephony network(s)2740 (e.g., public switched telephone network (PSTN), or public land mobile network (PLMN)) or a signaling system #7 (SS7) network2770. Circuit switched gateway node(s)2722 can authorize and authenticate traffic (e.g., voice) arising from such networks. Additionally, CS gateway node(s)2722 can access mobility, or roaming, data generated through SS7 network2770; for instance, mobility data stored in a visited location register (VLR), which can reside inmemory2730. Moreover, CS gateway node(s)2722 interfaces CS-based traffic and signaling and PS gateway node(s)2718. As an example, in a 3GPP UMTS network, CS gateway node(s)2722 can be realized at least in part in gateway GPRS support node(s) (GGSN). It should be appreciated that functionality and specific operation of CS gateway node(s)2722, PS gateway node(s)2718, and serving node(s)2716, is provided and dictated by radio technology(ies) utilized bymobile network platform2710 for telecommunication.
• In addition to receiving and processing CS-switched traffic and signaling, PS gateway node(s)2718 can authorize and authenticate PS-based data sessions with served mobile devices. Data sessions can comprise traffic, or content(s), exchanged with networks external to thewireless network platform2710, like wide area network(s) (WANs)2750, enterprise network(s)2770, and service network(s)2780, which can be embodied in local area network(s) (LANs), can also be interfaced withmobile network platform2710 through PS gateway node(s)2718. It is to be noted thatWANs2750 and enterprise network(s)2760 can embody, at least in part, a service network(s) like IP multimedia subsystem (IMS). Based on radio technology layer(s) available in technology resource(s)2717, packet-switched gateway node(s)2718 can generate packet data protocol contexts when a data session is established; other data structures that facilitate routing of packetized data also can be generated. To that end, in an aspect, PS gateway node(s)2718 can comprise a tunnel interface (e.g., tunnel termination gateway (TTG) in 3GPP UMTS network(s) (not shown)) which can facilitate packetized communication with disparate wireless network(s), such as Wi-Fi networks.
• Inembodiment2700,wireless network platform2710 also comprises serving node(s)2716 that, based upon available radio technology layer(s) within technology resource(s)2717, convey the various packetized flows of data streams received through PS gateway node(s)2718. It is to be noted that for technology resource(s)2717 that rely primarily on CS communication, server node(s) can deliver traffic without reliance on PS gateway node(s)2718; for example, server node(s) can embody at least in part a mobile switching center. As an example, in a 3GPP UMTS network, serving node(s)2716 can be embodied in serving GPRS support node(s) (SGSN).
• For radio technologies that exploit packetized communication, server(s)2714 inwireless network platform2710 can execute numerous applications that can generate multiple disparate packetized data streams or flows, and manage (e.g., schedule, queue, format . . . ) such flows. Such application(s) can comprise add-on features to standard services (for example, provisioning, billing, customer support . . . ) provided bywireless network platform2710. Data streams (e.g., content(s) that are part of a voice call or data session) can be conveyed to PS gateway node(s)2718 for authorization/authentication and initiation of a data session, and to serving node(s)2716 for communication thereafter. In addition to application server, server(s)2714 can comprise utility server(s), a utility server can comprise a provisioning server, an operations and maintenance server, a security server that can implement at least in part a certificate authority and firewalls as well as other security mechanisms, and the like. In an aspect, security server(s) secure communication served throughwireless network platform2710 to ensure network's operation and data integrity in addition to authorization and authentication procedures that CS gateway node(s)2722 and PS gateway node(s)2718 can enact. Moreover, provisioning server(s) can provision services from external network(s) like networks operated by a disparate service provider; for instance,WAN2750 or Global Positioning System (GPS) network(s) (not shown). Provisioning server(s) can also provision coverage through networks associated to wireless network platform2710 (e.g., deployed and operated by the same service provider), such as the distributed antennas networks shown inFIG. 1 that enhance wireless service coverage by providing more network coverage. Repeater devices such as those shown inFIGS. 7, 8, and 9 also improve network coverage in order to enhance subscriber service experience by way ofUE2775.
• It is to be noted that server(s)2714 can comprise one or more processors configured to confer at least in part the functionality ofmacro network platform2710. To that end, the one or more processor can execute code instructions stored inmemory2730, for example. It is should be appreciated that server(s)2714 can comprise a content manager2715, which operates in substantially the same manner as described hereinbefore.
• Inexample embodiment2700,memory2730 can store information related to operation ofwireless network platform2710. Other operational information can comprise provisioning information of mobile devices served throughwireless platform network2710, subscriber databases; application intelligence, pricing schemes, e.g., promotional rates, flat-rate programs, couponing campaigns; technical specification(s) consistent with telecommunication protocols for operation of disparate radio, or wireless, technology layers; and so forth.Memory2730 can also store information from at least one of telephony network(s)2740,WAN2750, enterprise network(s)2770, orSS7 network2760. In an aspect,memory2730 can be, for example, accessed as part of a data store component or as a remotely connected memory store.
• In order to provide a context for the various aspects of the disclosed subject matter,FIG. 27, and the following discussion, are intended to provide a brief, general description of a suitable environment in which the various aspects of the disclosed subject matter can be implemented. While the subject matter has been described above in the general context of computer-executable instructions of a computer program that runs on a computer and/or computers, those skilled in the art will recognize that the disclosed subject matter also can be implemented in combination with other program modules. Generally, program modules comprise routines, programs, components, data structures, etc. that perform particular tasks and/or implement particular abstract data types.
• FIG. 28 depicts an illustrative embodiment of acommunication device2800.
• Thecommunication device2800 can serve as an illustrative embodiment of devices such as mobile devices and in-building devices referred to by the subject disclosure (e.g., inFIGS. 15, 16A and 16B).
• Thecommunication device2800 can comprise a wireline and/or wireless transceiver2802 (herein transceiver2802), a user interface (UI)2804, apower supply2814, a location receiver2816, amotion sensor2818, anorientation sensor2820, and a controller2806 for managing operations thereof. Thetransceiver2802 can support short-range or long-range wireless access technologies such as Bluetooth®, ZigBee®, WiFi, DECT, or cellular communication technologies, just to mention a few (Bluetooth® and ZigBee® are trademarks registered by the Bluetooth® Special Interest Group and the ZigBee® Alliance, respectively). Cellular technologies can include, for example, CDMA-1X, UMTS/HSDPA, GSM/GPRS, TDMA/EDGE, EV/DO, WiMAX, SDR, LTE, as well as other next generation wireless communication technologies as they arise. Thetransceiver2802 can also be adapted to support circuit-switched wireline access technologies (such as PSTN), packet-switched wireline access technologies (such as TCP/IP, VoIP, etc.), and combinations thereof.
• TheUI2804 can include a depressible or touch-sensitive keypad2808 with a navigation mechanism such as a roller ball, a joystick, a mouse, or a navigation disk for manipulating operations of thecommunication device2800. Thekeypad2808 can be an integral part of a housing assembly of thecommunication device2800 or an independent device operably coupled thereto by a tethered wireline interface (such as a USB cable) or a wireless interface supporting for example Bluetooth®. Thekeypad2808 can represent a numeric keypad commonly used by phones, and/or a QWERTY keypad with alphanumeric keys. TheUI2804 can further include adisplay2810 such as monochrome or color LCD (Liquid Crystal Display), OLED (Organic Light Emitting Diode) or other suitable display technology for conveying images to an end user of thecommunication device2800. In an embodiment where thedisplay2810 is touch-sensitive, a portion or all of thekeypad2808 can be presented by way of thedisplay2810 with navigation features.
• Thedisplay2810 can use touch screen technology to also serve as a user interface for detecting user input. As a touch screen display, thecommunication device2800 can be adapted to present a user interface having graphical user interface (GUI) elements that can be selected by a user with a touch of a finger. Thetouch screen display2810 can be equipped with capacitive, resistive or other forms of sensing technology to detect how much surface area of a user's finger has been placed on a portion of the touch screen display. This sensing information can be used to control the manipulation of the GUI elements or other functions of the user interface. Thedisplay2810 can be an integral part of the housing assembly of thecommunication device2800 or an independent device communicatively coupled thereto by a tethered wireline interface (such as a cable) or a wireless interface.
• TheUI2804 can also include anaudio system2812 that utilizes audio technology for conveying low volume audio (such as audio heard in proximity of a human ear) and high volume audio (such as speakerphone for hands free operation). Theaudio system2812 can further include a microphone for receiving audible signals of an end user. Theaudio system2812 can also be used for voice recognition applications. TheUI2804 can further include animage sensor2813 such as a charged coupled device (CCD) camera for capturing still or moving images.
• Thepower supply2814 can utilize common power management technologies such as replaceable and rechargeable batteries, supply regulation technologies, and/or charging system technologies for supplying energy to the components of thecommunication device2800 to facilitate long-range or short-range portable communications. Alternatively, or in combination, the charging system can utilize external power sources such as DC power supplied over a physical interface such as a USB port or other suitable tethering technologies.
• The location receiver2816 can utilize location technology such as a global positioning system (GPS) receiver capable of assisted GPS for identifying a location of thecommunication device2800 based on signals generated by a constellation of GPS satellites, which can be used for facilitating location services such as navigation. Themotion sensor2818 can utilize motion sensing technology such as an accelerometer, a gyroscope, or other suitable motion sensing technology to detect motion of thecommunication device2800 in three-dimensional space. Theorientation sensor2820 can utilize orientation sensing technology such as a magnetometer to detect the orientation of the communication device2800 (north, south, west, and east, as well as combined orientations in degrees, minutes, or other suitable orientation metrics).
• Thecommunication device2800 can use thetransceiver2802 to also determine a proximity to a cellular, WiFi, Bluetooth®, or other wireless access points by sensing techniques such as utilizing a received signal strength indicator (RSSI) and/or signal time of arrival (TOA) or time of flight (TOF) measurements. The controller2806 can utilize computing technologies such as a microprocessor, a digital signal processor (DSP), programmable gate arrays, application specific integrated circuits, and/or a video processor with associated storage memory such as Flash, ROM, RAM, SRAM, DRAM or other storage technologies for executing computer instructions, controlling, and processing data supplied by the aforementioned components of thecommunication device2800.
• Other components not shown inFIG. 28 can be used in one or more embodiments of the subject disclosure. For instance, thecommunication device2800 can include a slot for adding or removing an identity module such as a Subscriber Identity Module (SIM) card or Universal Integrated Circuit Card (UICC). SIM or UICC cards can be used for identifying subscriber services, executing programs, storing subscriber data, and so on.
• In the subject specification, terms such as “store,” “storage,” “data store,” data storage,” “database,” and substantially any other information storage component relevant to operation and functionality of a component, refer to “memory components,” or entities embodied in a “memory” or components comprising the memory. It will be appreciated that the memory components described herein can be either volatile memory or nonvolatile memory, or can comprise both volatile and nonvolatile memory, by way of illustration, and not limitation, volatile memory, non-volatile memory, disk storage, and memory storage. Further, nonvolatile memory can be included in read only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable ROM (EEPROM), or flash memory. Volatile memory can comprise random access memory (RAM), which acts as external cache memory. By way of illustration and not limitation, RAM is available in many forms such as synchronous RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDR SDRAM), enhanced SDRAM (ESDRAM), Synchlink DRAM (SLDRAM), and direct Rambus RAM (DRRAM). Additionally, the disclosed memory components of systems or methods herein are intended to comprise, without being limited to comprising, these and any other suitable types of memory.
• Moreover, it will be noted that the disclosed subject matter can be practiced with other computer system configurations, comprising single-processor or multiprocessor computer systems, mini-computing devices, mainframe computers, as well as personal computers, hand-held computing devices (e.g., PDA, phone, smartphone, watch, tablet computers, netbook computers, etc.), microprocessor-based or programmable consumer or industrial electronics, and the like. The illustrated aspects can also be practiced in distributed computing environments where tasks are performed by remote processing devices that are linked through a communications network; however, some if not all aspects of the subject disclosure can be practiced on stand-alone computers. In a distributed computing environment, program modules can be located in both local and remote memory storage devices.
• Some of the embodiments described herein can also employ artificial intelligence (AI) to facilitate automating one or more features described herein. For example, artificial intelligence can be used inoptional training controller230 evaluate and select candidate frequencies, modulation schemes, MIMO modes, and/or guided wave modes in order to maximize transfer efficiency. The embodiments (e.g., in connection with automatically identifying acquired cell sites that provide a maximum value/benefit after addition to an existing communication network) can employ various AI-based schemes for carrying out various embodiments thereof. Moreover, the classifier can be employed to determine a ranking or priority of the each cell site of the acquired network. A classifier is a function that maps an input attribute vector, x=(x1, x2, x3, x4, . . . , xn), to a confidence that the input belongs to a class, that is, f(x)=confidence (class). Such classification can employ a probabilistic and/or statistical-based analysis (e.g., factoring into the analysis utilities and costs) to prognose or infer an action that a user desires to be automatically performed. A support vector machine (SVM) is an example of a classifier that can be employed. The SVM operates by finding a hypersurface in the space of possible inputs, which the hypersurface attempts to split the triggering criteria from the non-triggering events. Intuitively, this makes the classification correct for testing data that is near, but not identical to training data. Other directed and undirected model classification approaches comprise, e.g., naïve Bayes, Bayesian networks, decision trees, neural networks, fuzzy logic models, and probabilistic classification models providing different patterns of independence can be employed. Classification as used herein also is inclusive of statistical regression that is utilized to develop models of priority.
• As will be readily appreciated, one or more of the embodiments can employ classifiers that are explicitly trained (e.g., via a generic training data) as well as implicitly trained (e.g., via observing UE behavior, operator preferences, historical information, receiving extrinsic information). For example, SVMs can be configured via a learning or training phase within a classifier constructor and feature selection module. Thus, the classifier(s) can be used to automatically learn and perform a number of functions, including but not limited to determining according to a predetermined criteria which of the acquired cell sites will benefit a maximum number of subscribers and/or which of the acquired cell sites will add minimum value to the existing communication network coverage, etc.
• As used in some contexts in this application, in some embodiments, the terms “component,” “system” and the like are intended to refer to, or comprise, a computer-related entity or an entity related to an operational apparatus with one or more specific functionalities, wherein the entity can be either hardware, a combination of hardware and software, software, or software in execution. As an example, a component may be, but is not limited to being, a process running on a processor, a processor, an object, an executable, a thread of execution, computer-executable instructions, a program, and/or a computer. By way of illustration and not limitation, both an application running on a server and the server can be a component. One or more components may reside within a process and/or thread of execution and a component may be localized on one computer and/or distributed between two or more computers. In addition, these components can execute from various computer readable media having various data structures stored thereon. The components may communicate via local and/or remote processes such as in accordance with a signal having one or more data packets (e.g., data from one component interacting with another component in a local system, distributed system, and/or across a network such as the Internet with other systems via the signal). As another example, a component can be an apparatus with specific functionality provided by mechanical parts operated by electric or electronic circuitry, which is operated by a software or firmware application executed by a processor, wherein the processor can be internal or external to the apparatus and executes at least a part of the software or firmware application. As yet another example, a component can be an apparatus that provides specific functionality through electronic components without mechanical parts, the electronic components can comprise a processor therein to execute software or firmware that confers at least in part the functionality of the electronic components. While various components have been illustrated as separate components, it will be appreciated that multiple components can be implemented as a single component, or a single component can be implemented as multiple components, without departing from example embodiments.
• Further, the various embodiments can be implemented as a method, apparatus or article of manufacture using standard programming and/or engineering techniques to produce software, firmware, hardware or any combination thereof to control a computer to implement the disclosed subject matter. The term “article of manufacture” as used herein is intended to encompass a computer program accessible from any computer-readable device or computer-readable storage/communications media. For example, computer readable storage media can include, but are not limited to, magnetic storage devices (e.g., hard disk, floppy disk, magnetic strips), optical disks (e.g., compact disk (CD), digital versatile disk (DVD)), smart cards, and flash memory devices (e.g., card, stick, key drive). Of course, those skilled in the art will recognize many modifications can be made to this configuration without departing from the scope or spirit of the various embodiments.
• In addition, the words “example” and “exemplary” are used herein to mean serving as an instance or illustration. Any embodiment or design described herein as “example” or “exemplary” is not necessarily to be construed as preferred or advantageous over other embodiments or designs. Rather, use of the word example or exemplary is intended to present concepts in a concrete fashion. As used in this application, the term “or” is intended to mean an inclusive “or” rather than an exclusive “or”. That is, unless specified otherwise or clear from context, “X employs A or B” is intended to mean any of the natural inclusive permutations. That is, if X employs A; X employs B; or X employs both A and B, then “X employs A or B” is satisfied under any of the foregoing instances. In addition, the articles “a” and “an” as used in this application and the appended claims should generally be construed to mean “one or more” unless specified otherwise or clear from context to be directed to a singular form.
• Moreover, terms such as “user equipment,” “mobile station,” “mobile,” subscriber station,” “access terminal,” “terminal,” “handset,” “mobile device” (and/or terms representing similar terminology) can refer to a wireless device utilized by a subscriber or user of a wireless communication service to receive or convey data, control, voice, video, sound, gaming or substantially any data-stream or signaling-stream. The foregoing terms are utilized interchangeably herein and with reference to the related drawings.
• Furthermore, the terms “user,” “subscriber,” “customer,” “consumer” and the like are employed interchangeably throughout, unless context warrants particular distinctions among the terms. It should be appreciated that such terms can refer to human entities or automated components supported through artificial intelligence (e.g., a capacity to make inference based, at least, on complex mathematical formalisms), which can provide simulated vision, sound recognition and so forth.
• As employed herein, the term “processor” can refer to substantially any computing processing unit or device comprising, but not limited to comprising, single-core processors; single-processors with software multithread execution capability; multi-core processors; multi-core processors with software multithread execution capability; multi-core processors with hardware multithread technology; parallel platforms; and parallel platforms with distributed shared memory. Additionally, a processor can refer to an integrated circuit, an application specific integrated circuit (ASIC), a digital signal processor (DSP), a field programmable gate array (FPGA), a programmable logic controller (PLC), a complex programmable logic device (CPLD), a discrete gate or transistor logic, discrete hardware components or any combination thereof designed to perform the functions described herein. Processors can exploit nano-scale architectures such as, but not limited to, molecular and quantum-dot based transistors, switches and gates, in order to optimize space usage or enhance performance of user equipment. A processor can also be implemented as a combination of computing processing units.
• As used herein, terms such as “data storage,” data storage,” “database,” and substantially any other information storage component relevant to operation and functionality of a component, refer to “memory components,” or entities embodied in a “memory” or components comprising the memory. It will be appreciated that the memory components or computer-readable storage media, described herein can be either volatile memory or nonvolatile memory or can include both volatile and nonvolatile memory.
• What has been described above includes mere examples of various embodiments. It is, of course, not possible to describe every conceivable combination of components or methodologies for purposes of describing these examples, but one of ordinary skill in the art can recognize that many further combinations and permutations of the present embodiments are possible. Accordingly, the embodiments disclosed and/or claimed herein are intended to embrace all such alterations, modifications and variations that fall within the spirit and scope of the appended claims. Furthermore, to the extent that the term “includes” is used in either the detailed description or the claims, such term is intended to be inclusive in a manner similar to the term “comprising” as “comprising” is interpreted when employed as a transitional word in a claim.
• In addition, a flow diagram may include a “start” and/or “continue” indication. The “start” and “continue” indications reflect that the steps presented can optionally be incorporated in or otherwise used in conjunction with other routines. In this context, “start” indicates the beginning of the first step presented and may be preceded by other activities not specifically shown. Further, the “continue” indication reflects that the steps presented may be performed multiple times and/or may be succeeded by other activities not specifically shown. Further, while a flow diagram indicates a particular ordering of steps, other orderings are likewise possible provided that the principles of causality are maintained.
• As may also be used herein, the term(s) “operably coupled to”, “coupled to”, and/or “coupling” includes direct coupling between items and/or indirect coupling between items via one or more intervening items. Such items and intervening items include, but are not limited to, junctions, communication paths, components, circuit elements, circuits, functional blocks, and/or devices. As an example of indirect coupling, a signal conveyed from a first item to a second item may be modified by one or more intervening items by modifying the form, nature or format of information in a signal, while one or more elements of the information in the signal are nevertheless conveyed in a manner than can be recognized by the second item. In a further example of indirect coupling, an action in a first item can cause a reaction on the second item, as a result of actions and/or reactions in one or more intervening items.
• Although specific embodiments have been illustrated and described herein, it should be appreciated that any arrangement which achieves the same or similar purpose may be substituted for the embodiments described or shown by the subject disclosure. The subject disclosure is intended to cover any and all adaptations or variations of various embodiments. Combinations of the above embodiments, and other embodiments not specifically described herein, can be used in the subject disclosure. For instance, one or more features from one or more embodiments can be combined with one or more features of one or more other embodiments. In one or more embodiments, features that are positively recited can also be negatively recited and excluded from the embodiment with or without replacement by another structural and/or functional feature. The steps or functions described with respect to the embodiments of the subject disclosure can be performed in any order. The steps or functions described with respect to the embodiments of the subject disclosure can be performed alone or in combination with other steps or functions of the subject disclosure, as well as from other embodiments or from other steps that have not been described in the subject disclosure. Further, more than or less than all of the features described with respect to an embodiment can also be utilized.

Claims (20)

What is claimed is:

1. A method, comprising:

receiving a plurality of communication signals; and

generating, by a transmitting device according to the plurality of communication signals, a plurality of wireless signals that induces a plurality of electromagnetic waves that propagates along a pseudo dielectric layer of an uninsulated conductor, wherein the plurality of electromagnetic waves propagates along the pseudo dielectric layer of the uninsulated conductor without an electrical return path, and wherein each electromagnetic wave of the plurality of electromagnetic waves conveys at least a portion of the plurality of communication signals.

2. The method ofclaim 1, wherein the physical structure of the outer surface of the uninsulated conductor comprises a corrugated structure.

3. The method ofclaim 1, wherein the physical structure of the outer surface of the uninsulated conductor comprises a helical structure.

4. The method ofclaim 1, wherein the uninsulated conductor comprises a multi-stranded conductor, and wherein the physical structure of the outer surface of the uninsulated conductor is formed from the multi-stranded conductor.

5. The method ofclaim 1, wherein the physical structure of the outer surface of the uninsulated conductor comprises a non-uniform structure.

6. The method ofclaim 1, wherein the pseudo dielectric layer is formed by a physical structure of an outer surface of the uninsulated conductor, an oxidation of the outer surface of the uninsulated conductor, or a combination thereof.

7. The method ofclaim 6, wherein the plurality of electromagnetic waves has a plurality of wave modes that at least reduces interference between the plurality of electromagnetic waves, and wherein one of the plurality of wave modes comprises a fundamental wave mode and another of the plurality of wave modes comprises a non-fundamental wave mode.

8. The method ofclaim 6, wherein the plurality of electromagnetic waves has a plurality of wave modes that at least reduces interference between the plurality of electromagnetic waves, and wherein one of the plurality of wave modes comprises a hybrid wave mode.

9. The method ofclaim 8, wherein the hybrid wave mode comprises an HE11 wave mode.

10. The method ofclaim 6, wherein the plurality of electromagnetic waves has a plurality of wave modes that at least reduces interference between the plurality of electromagnetic waves, wherein the plurality of wave modes comprises a first hybrid wave mode and a second hybrid wave mode, and wherein the first hybrid wave mode has a first target polarization, and wherein the second hybrid wave mode has a second target polarization.

11. The method ofclaim 10, wherein a first electromagnetic wave of the plurality of electromagnetic waves has the first hybrid wave mode and a second electromagnetic wave of the plurality of electromagnetic waves has the second hybrid wave mode, and wherein the first target polarization and second target polarization reduce interference between the first electromagnetic wave and the second electromagnetic wave.

12. The method ofclaim 10, wherein the first target polarization is substantially orthogonal to the second target polarization.

13. The method ofclaim 10, wherein the first target polarization comprises a horizontal polarization, and wherein the second target polarization comprises a vertical polarization.

14. The method ofclaim 6, wherein the plurality of electromagnetic waves has a plurality of wave modes that at least reduces interference between the plurality of electromagnetic waves, and wherein the plurality of wave modes facilitates wave mode division multiplexing, frequency division multiplexing, or both.

15. The method ofclaim 14, further comprising:

detecting an obstruction causing propagation losses affecting at least one of the plurality of electromagnetic waves; and

adjusting the at least one of the plurality of electromagnetic waves according to a wave mode division multiplexing configuration or a frequency division multiplexing configuration to reduce the propagation losses.

16. A launcher, comprising:

a generator; and

a circuit coupled to the generator,

wherein the circuit performs operations including:

receiving a communication signal; and

generating, by the generator according to the communication signal, a plurality of wireless signals that induce propagation of an electromagnetic wave that along a pseudo dielectric layer of a conductor, wherein the electromagnetic wave propagates along the dielectric layer of the conductor without an electrical return path, and wherein the electromagnetic wave conveys the communication signal.

17. The launcher ofclaim 16, wherein the pseudo dielectric layer is formed by a physical structure of an outer surface of the conductor, an oxidation of the outer surface of the conductor, or a combination thereof.

18. A device, comprising:

means for receiving a communication signal; and

means for generating, according to the communication signal, a plurality of wireless signals that induce propagation of an electromagnetic wave along a pseudo dielectric layer of a conductor, wherein the electromagnetic wave propagates along the pseudo dielectric layer of the conductor without an electrical return path, and wherein the electromagnetic wave conveys the communication signal.

19. The device ofclaim 18, wherein the pseudo dielectric layer is formed by a physical structure of an outer surface of the conductor, an oxidation of the outer surface of the conductor, or a combination thereof.

20. The device ofclaim 19, wherein the physical structure of the outer surface of the conductor comprises a non-uniform structure, and wherein the conductor comprises a multi-stranded conductor, and wherein the physical structure of the outer surface of the conductor is formed from the multi-stranded conductor.

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